Update PR comment wording

.github/workflows/close-external-prs.yml

@@ -27,7 +27,7 @@ jobs:
                   owner: context.repo.owner,
                   repo: context.repo.repo,
                   issue_number: context.payload.pull_request.number,
-                  body: `Thanks for your interest! This repo only accepts contributions from Anthropic team members. If you'd like to submit a plugin to the marketplace, please see [our submission process](https://docs.google.com/forms/d/e/1FAIpQLSdeFthxvjOXUjxg1i3KrOOkEPDJtn71XC-KjmQlxNP63xYydg/viewform).`
+                  body: `Thanks for your interest! This repo only accepts contributions from Anthropic team members. If you'd like to submit a plugin to the marketplace, please submit your plugin [here](https://docs.google.com/forms/d/e/1FAIpQLSdeFthxvjOXUjxg1i3KrOOkEPDJtn71XC-KjmQlxNP63xYydg/viewform).`
                 });
 
                 await github.rest.pulls.update({