doc: update checkbox label in backporting guide

Signed-off-by: Darshan Sen <[email protected]>

PR-URL: #39420
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: James M Snell <[email protected]>

Author: RaisinTen

doc/guides/backporting-to-release-lines.md

@@ -77,7 +77,8 @@ replace that with the staging branch for the targeted release line.
    1. Include the backport target in the pull request title in the following
       format: `[v10.x backport] <commit title>`.
       Example: `[v10.x backport] process: improve performance of nextTick`
-   1. Check the checkbox labeled "Allow edits from maintainers".
+   1. Check the checkbox labeled "Allow edits and access to secrets by
+      maintainers".
    1. In the description add a reference to the original pull request.
    1. Amend the commit message and include a `Backport-PR-URL:` metadata and
       re-push the change to your fork.