ci: fix README.md in report-job-status action

README.md in the `report-job-status` action was fixed in accordance
with the new name policy for supported branches (2.10 -> release/2.10,
2.11 -> release/2.11).

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

(cherry picked from commit fa33c5e5)

.github/actions/report-job-status/README.md

@@ -4,7 +4,7 @@ This action selects the corresponding chat for the notification on failure and
 uses [report-job-status action](https://github.com/tarantool/actions/tree/master/report-job-status)
 for sending it to:
 * the team chat (Tarantool CI/CD reports) - if the job started on any event in
-the `master` or release branch (`1.10`, `2.10`, etc);
+the `master` or release branch;
 * a personal chat, created by the committer – if the job started on
 creating/updating a pull request or any event in other branches.