Merge branch '55706-remove-ci_commit_ref-docs' into 'master'

Replace CI_COMMIT_REF with CI_COMMIT_SHA on CI docs

Closes #55706

See merge request gitlab-org/gitlab!21781

changelogs/unreleased/55706-remove-ci_commit_ref-docs.yml

+---
+title: Replace CI_COMMIT_REF with CI_COMMIT_SHA on CI docs
+merge_request: 21781
+author: Takuya Noguchi
+type: other

doc/ci/variables/README.md

@@ -699,8 +699,8 @@ Running on runner-8a2f473d-project-1796893-concurrent-0 via runner-8a2f473d-mach
 ++ CI_JOB_ID=7046507
 ++ export CI_JOB_TOKEN=xxxxxxxxxxxxxxxxxxxx
 ++ CI_JOB_TOKEN=xxxxxxxxxxxxxxxxxxxx
-++ export CI_COMMIT_REF=dd648b2e48ce6518303b0bb580b2ee32fadaf045
-++ CI_COMMIT_REF=dd648b2e48ce6518303b0bb580b2ee32fadaf045
+++ export CI_COMMIT_SHA=dd648b2e48ce6518303b0bb580b2ee32fadaf045
+++ CI_COMMIT_SHA=dd648b2e48ce6518303b0bb580b2ee32fadaf045
 ++ export CI_COMMIT_BEFORE_SHA=dd648b2e48ce6518303b0bb580b2ee32fadaf045
 ++ CI_COMMIT_BEFORE_SHA=dd648b2e48ce6518303b0bb580b2ee32fadaf045
 ++ export CI_COMMIT_REF_NAME=master