Update gemini config.yaml (#2162)

Author: devoncarew

.gemini/config.yaml

@@ -1,12 +1,18 @@
 # See https://developers.google.com/gemini-code-assist/docs/customize-gemini-behavior-github#custom-configurations
 
-have_fun: false # We are serious people in the Dart team!
+# We are serious people in the Dart team!
+have_fun: false
+
 code_review:
   disable: false
+  # Valid levels are LOW, MEDIUM, or HIGH.
   comment_severity_threshold: MEDIUM
   max_review_comments: 100
   pull_request_opened:
-    help: true
-    summary: true
     code_review: true
+    # Make the gemini PR comment more terse.
+    help: false
+    # Make the gemini PR comment more terse.
+    summary: false
+
 ignore_patterns: []