tests: run kdoc on pull requests

Brancher now uses kdoc as a gating test (to prevent broken
kdoc from getting flagged as warnings for the second time
in the documentation build). Make sure we run that test
on PRs, otherwise PRs don't get propagated into contest.

Signed-off-by: Jakub Kicinski <[email protected]>

tests/patch/kdoc/info.json

@@ -1,3 +1,4 @@
 {
-  "run": ["kdoc.sh"]
+  "run": ["kdoc.sh"],
+  "pull-requests": true
 }