fix: creation link ctd.

__tests__/fixtures/pull_request/github/comment_create_body_expected.js

@@ -9,7 +9,7 @@ By commenting on this PR with: \`:rocket:[<pipeline>]\`, e.g.
 | Comment | Description | More info |
 | --- | --- | --- |
 | \`:rocket:[a-pipeline]\` |  | [:information_source:](https://example.com/does-templating-work?COMMITISH=c0ffeec0ffeec0ffeec0ffeec0ffeec0ffeec0ffeec0ffe&ORG=some-org&REPO=some-repo "See more information") |
-| \`:rocket:[some-pipeline]\` |  | [:heavy_plus_sign:](https://github.com/new/master?filename=.buildkite%2Fpipeline%2Fdescription%2Fsome-org%2Fsome-pipeline.md&value=%23+some-pipeline%0A%0A%5BDocument+some-pipeline%27s+RocketBot+options+here%5D "Add more information") |
+| \`:rocket:[some-pipeline]\` |  | [:heavy_plus_sign:](https://github.com/some-org/some-repo/new/master?filename=.buildkite%2Fpipeline%2Fdescription%2Fsome-org%2Fsome-pipeline.md&value=%23+some-pipeline%0A%0A%5BDocument+some-pipeline%27s+RocketBot+options+here%5D "Add more information") |
 | \`:rocket:[some-pipeline-lite]\` | This is a proper description with a \\| pipe | [:information_source:](https://github.com/some-org/some-repo/blob/master/.buildkite/pipeline/description/some-org/some-pipeline-lite.md "See more information") |
 
 _Note: you can pass [custom environment variables](https://github.com/canva-public/rocketbot/blob/main/docs/guides/pass-in-variables.md) to some builds._

src/initial_comment.ts

@@ -154,8 +154,8 @@ function getDocumentationCreationLink(
   pipeline: Pipeline,
 ) {
   const url = new URL(
-    `/new/${prData.head.repo.default_branch}`,
-    `https://github.com/${prData.head.repo.full_name}`,
+    `/${prData.head.repo.full_name}/new/${prData.head.repo.default_branch}`,
+    `https://github.com`,
   );
   url.searchParams.append(
     'filename',