doc/arch_diagram: Update architecture diagram with a small legend

Trivial change to display which are API calls, which are Wayland ones.

Bug-AGL: SPEC-3386

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I265e19baaa7437af4221a71378706661395b4445

2 files changed, 186 insertions, 83 deletions

diff --git a/doc/arch_diagram.png b/doc/arch_diagram.png
index a84a4a1..88a4381 100644
--- a/doc/arch_diagram.png
+++ b/doc/arch_diagram.png
diff --git a/doc/arch_diagram.svg b/doc/arch_diagram.svg
index 0ceba6e..5b34c26 100644
--- a/doc/arch_diagram.svg
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