DOC: Eventloop -> event-loop

...small Fix in the diagram proposed by Benny,
improves readability for the non-technical reader

doc/devel/draw/Lumi.Architecture-2.svg

@@ -16,7 +16,6 @@
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@@ -2394,15 +2393,15 @@ envisioned Lumiera Architecture 2022
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doc/devel/draw/VerticalSlice.Playback.svg

@@ -2543,15 +2543,15 @@ Indicated: scope of the planned Playback-Vertical-Slice
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