Improving Developer 3_Developer_Guides

Worked on creating new services and applications.
1. Removed Fixme file
2. Formatted some text and numbering
3. Fixed some broken links.

Bug-AGL: [SPEC-4470]
Signed-off-by: Vinod Ahuja <vahuja@unomaha.edu>
Change-Id: If3f9a171faff8466bd6d141f9537cd98468fadbb
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/documentation/+/27993
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>

3 files changed, 25 insertions, 17 deletions

diff --git a/docs/3_Developer_Guides/0_FIXME.md b/docs/3_Developer_Guides/0_FIXME.md
deleted file mode 100644
index e69de29..0000000
--- a/docs/3_Developer_Guides/0_FIXME.md
+++ /dev/null
diff --git a/docs/3_Developer_Guides/2_Creating_a_New_Service.md b/docs/3_Developer_Guides/2_Creating_a_New_Service.md
index 7974d00..0fb2453 100644
--- a/docs/3_Developer_Guides/2_Creating_a_New_Service.md
+++ b/docs/3_Developer_Guides/2_Creating_a_New_Service.md
@@ -4,10 +4,12 @@ title: Creating a New Service
 
 Services are software running in the background and providing, as their name suggests,
 various services to other software: access to specific system hardware, connectivity
-management, network servers... They can be split into 2 categories:
-- system services: those usually run as a privileged user and make use of shared system
+management, and network servers. Services can be split into 2 categories:
+
+- **System services:** those usually run as a privileged user and make use of shared system
   resources which they should have exclusive access to
-- user services: such services run as part of an unprivileged user's session and can
+
+- **User services:** such services run as part of an unprivileged user's session and can
   only be called by said user
 
 # Basic requirements
@@ -15,7 +17,9 @@ management, network servers... They can be split into 2 categories:
 The only mandatory requirement is that service packages provide a `.service` file
 so they can be properly managed by `systemd`. This file must be installed to a specific
 location, determined by the service type (system or user):
+
 - `/usr/lib/systemd/system/` for system services
+
 - `/usr/lib/systemd/user/` for user services
 
 Below is an example of a simple user service, running in a graphical session and
@@ -36,7 +40,7 @@ WantedBy=agl-session.target
 ```
 
 The `WantedBy=agl-session.target` indicates the service is part of the default AGL
-user session, as mentioned in the [Application Framework](1_Application_Framework/1_Introduction/#user-session-management)
+user session, as mentioned in the [Application Framework](../1_Application_Framework/1_Introduction/#user-session-management)
 documentation.
 
 The `Restart=on-failure` directive ensures the service will be automatically
@@ -65,7 +69,9 @@ ExecStart=/path/to/executable
 
 In addition, they must provide a D-Bus service file named `NAME.service` and installed
 to one of the following locations:
+
 - `/usr/share/dbus-1/system-services` for system services
+
 - `/usr/share/dbus-1/services` for user services
 
 The contents of the D-Bus service file must be the following:
@@ -95,19 +101,19 @@ executed on system or session startup.
 System services can take advantage of the Yocto `systemd` class which automates the process of
 enabling such services.
 
-1. Ensure the recipe inherits from the `systemd` class:
+1\. Ensure the recipe inherits from the `systemd` class:
 
 ```
 inherit systemd
 ```
 
-2. Declare the system services that needs to be enabled on boot:
+2\. Declare the system services that needs to be enabled on boot:
 
 ```
 SYSTEMD_SERVICE:${PN} = "NAME.service"
 ```
 
-3. Ensure the `FILES` variable includes the systemd service directory the corresponding
+3\. Ensure the `FILES` variable includes the systemd service directory the corresponding
 file will be installed to:
 
 ```
@@ -122,7 +128,7 @@ FILES:${PN} = "\
 The `systemd` class doesn't provide an equivalent mechanism for user services. This must
 therefore be done manually as part of the package's install process.
 
-1. Make the service a part of the user session:
+1\. Make the service a part of the user session:
 
 ```
 do_install:append() {
@@ -134,7 +140,7 @@ do_install:append() {
 This ensures `agl-session.target` depends on `NAME.service`, the latter being therefore
 automatically started on session creation.
 
-2. Ensure the `FILES` variable includes the systemd service directory the corresponding
+2\. Ensure the `FILES` variable includes the systemd service directory the corresponding
 file will be installed to:
 
 ```
diff --git a/docs/3_Developer_Guides/3_Creating_a_New_Application.md b/docs/3_Developer_Guides/3_Creating_a_New_Application.md
index c98cf1c..ed89ecc 100644
--- a/docs/3_Developer_Guides/3_Creating_a_New_Application.md
+++ b/docs/3_Developer_Guides/3_Creating_a_New_Application.md
@@ -2,11 +2,13 @@
 title: Creating a New Application
 ---
 
-Applications are either software designed to perform a specific task during a limited amount of
-time, or graphical applications presenting the user with an interface they can interact with.
+Applications are:
 
-Such applications are executed by `applaunchd`, the AGL
-[application launcher service](1_Application_Framework/2_Application_Startup/).
+-  Software designed to perform a specific task during a limited amount of time.
+-  Graphical interface allowing user to interact with.
+
+Applications are executed by `applaunchd`, the AGL
+[application launcher service](../1_Application_Framework/2_Application_Startup/).
 
 # Basic requirements
 
@@ -58,7 +60,7 @@ refer to the [graphical applications](#graphical-applications) section for more
 
 # D-Bus activation
 
-Similarly to [services](2_Creating_a_New_Service.md/#d-bus-activation), applications can
+Similarly to [services](../2_Creating_a_New_Service/#d-bus-activation), applications can
 also be activated through D-Bus.
 
 Such applications must name their `.desktop` file after the D-Bus name they register. In addition,
@@ -116,16 +118,16 @@ implement the `org.freedesktop.Application` interface as defined in the
 
 In addition, graphical applications need to comply with a few more requirements:
 
-1. Each application must set a Wayland application ID appropriately as soon as its main window
+1\. Each application must set a Wayland application ID appropriately as soon as its main window
 is created.
 
-2. The `app-id` must be specified in the desktop entry file by adding the following line:
+2\. The `app-id` must be specified in the desktop entry file by adding the following line:
 
 ```
 StartupWMClass=APP_ID
 ```
 
-3. The desktop entry file must be named `APP_ID.desktop`.
+3\. The desktop entry file must be named `APP_ID.desktop`.
 
 Doing so will ensure other software can associate the actual `app-id` to the proper application.