fix(Source): Fix broken code host doc links

[mmanela]

Fixes urls to doc pages that do not resolve anymore

Test plan

• Test new urls are valid

[mmanela]

@jhchabran After this is fixed we need to get sourcegraph repo to use it so we can re-generate doc/cli/references/serve-git.md. Can you point me to how I do that?

[jhchabran]

@mmanela

1. Need to cut a new release in src-cli
2. Update SRC_CLI_VERSION
3. Run sg bazel //doc/cli/references:write_doc_files (the classic approach is to use //dev:write_all_generated but I gave you the specific target that does it so it's faster).

• It will fail on the first run, complaining about a different checksum for the archive, take the new one and update it in the same file.
• On the second run it will update the docs.

4. Commit and open a PR.
5. Once it lands on main, it will automatically generates a PR toward the docs repo.