fix Microsoft.Quotes vale findings - move punctuation inside quotes

Moved 27 instances of periods and commas from outside closing quote marks
to inside, following American-style punctuation placement. Changes span
across ~15 documentation files including integration, process, scheduler,
trust-boundary, and web-ui docs.

docs/integrations/matrix.md

@@ -278,7 +278,7 @@ Two subtle details worth knowing before touching either derivation:
   needs to hit `buildFlutterApplication`'s pub-get output
   (`.dart_tool/` in the build CWD). Walking up from a read-only
   `$src/` store path finds no `.dart_tool/` and errors with
-  "Couldn't resolve the package 'matrix'".
+  "Couldn't resolve the package 'matrix'."
 
 Drop both derivations when nixpkgs's flutter builder grows worker
 + emcc support upstream.