Append PR comment as documentation

Author: acecilia

MODULE.bazel

@@ -743,7 +743,7 @@ dev_maven.install(
         "androidx.compose.foundation:foundation-layout:1.5.0-beta01",
         # https://github.com/bazel-contrib/rules_jvm_external/issues/909#issuecomment-2019217013
         "androidx.annotation:annotation:1.6.0",
-        # Snapshot pinning support
+        # Snapshot pinning support: https://github.com/bazel-contrib/rules_jvm_external/pull/1412
         "com.google.guava:guava:999.0.0-HEAD-jre-SNAPSHOT",
     ],
     generate_compat_repositories = True,