docs(qa-gate): use -F for typed boolean strict=false (MCP-1227) (#619)

gh api -f sends all values as strings, so -f strict=false fails the branch
protection PATCH with HTTP 422 ("false" is not a boolean). Use uppercase -F
for the typed boolean; contexts[] entries correctly stay on -f (strings).

Author: Dumbris

docs/qa-merge-gate.md

@@ -56,7 +56,7 @@ Add the three new contexts (keeps `enforce_admins: false`):
 
 ```bash
 gh api -X PATCH repos/:owner/:repo/branches/main/protection/required_status_checks \
-  -f strict=false \
+  -F strict=false \
   -f 'contexts[]=Lint' \
   -f 'contexts[]=Unit Tests (ubuntu-latest, 1.25)' \
   -f 'contexts[]=Build (ubuntu-latest)' \