doc: sort references in ASCII order

The references in the COLLABORATOR_GUIDE appear to be in no particular
order. Sort in ASCII order.

PR-URL: nodejs#20790
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

COLLABORATOR_GUIDE.md

@@ -875,17 +875,17 @@ When things need extra attention, are controversial, or `semver-major`:
 
 If you cannot find who to cc for a file, `git shortlog -n -s <file>` may help.
 
-[backporting guide]: doc/guides/backporting-to-release-lines.md
-[contributing]: ./doc/guides/contributing/pull-requests.md#commit-message-guidelines
-[Stability Index]: doc/api/documentation.md#stability-index
+["Merge Pull Request"]: https://help.github.com/articles/merging-a-pull-request/#merging-a-pull-request-on-github
 [Enhancement Proposal]: https://github.com/nodejs/node-eps
+[Stability Index]: doc/api/documentation.md#stability-index
+[TSC]: https://github.com/nodejs/TSC
 [`--pending-deprecation`]: doc/api/cli.md#--pending-deprecation
+[`node-core-utils`]: https://github.com/nodejs/node-core-utils
+[backporting guide]: doc/guides/backporting-to-release-lines.md
+[contributing]: ./doc/guides/contributing/pull-requests.md#commit-message-guidelines
+[flaky tests]: https://github.com/nodejs/node/issues?q=is%3Aopen+is%3Aissue+label%3A%22CI+%2F+flaky+test%22y
 [git-node]: https://github.com/nodejs/node-core-utils/blob/master/docs/git-node.md
 [git-node-metadata]: https://github.com/nodejs/node-core-utils/blob/master/docs/git-node.md#git-node-metadata
 [git-username]: https://help.github.com/articles/setting-your-username-in-git/
-[`node-core-utils`]: https://github.com/nodejs/node-core-utils
-[TSC]: https://github.com/nodejs/TSC
-[node-core-utils-issues]: https://github.com/nodejs/node-core-utils/issues
 [node-core-utils-credentials]: https://github.com/nodejs/node-core-utils#setting-up-credentials
-["Merge Pull Request"]: https://help.github.com/articles/merging-a-pull-request/#merging-a-pull-request-on-github
-[flaky tests]: https://github.com/nodejs/node/issues?q=is%3Aopen+is%3Aissue+label%3A%22CI+%2F+flaky+test%22
+[node-core-utils-issues]: https://github.com/nodejs/node-core-utils/issues