[7.4.0] Fix the documentation for bazel fetch --configure

[bazel-io]

Forked from #23665

[bazel-io]

Cherry-pick was attempted but there were merge conflicts in the following file(s). Please resolve manually.

site/en/extending/repo.md
third_party/cncf_udpa/BUILD

cc: @bazelbuild/triage

[iancha1992]

Cherry-pick was attempted but there were merge conflicts in the following file(s). Please resolve manually.

site/en/extending/repo.md third_party/cncf_udpa/BUILD

cc: @bazelbuild/triage

@fmeum @Wyverald @meteorcloudy

[fmeum]

Something is wrong here, this commit shouldn't have touched third_party

[meteorcloudy]

@iancha1992 Can you try to manually cherry-pick c04a561?

[iancha1992]

@iancha1992 Can you try to manually cherry-pick c04a561?

@meteorcloudy @fmeum I am getting the merge conflicts in the same files as well when I cherry-pick that commit