Update locale_en-US.ini (#1235)

Author: geek1011

options/locale/locale_en-US.ini

@@ -1006,7 +1006,7 @@ dashboard.delete_missing_repos = Delete all repository records which have lost t
 dashboard.delete_missing_repos_success = All repository records which have lost their corresponding Git files have been deleted successfully.
 dashboard.git_gc_repos = Execute garbage collection on all repositories
 dashboard.git_gc_repos_success = All repositories have executed garbage collection successfully.
-dashboard.resync_all_sshkeys = Rewrite '.ssh/authorized_keys' file (caution: non-Gitea keys will be lost)
+dashboard.resync_all_sshkeys = Rewrite '.ssh/authorized_keys' file (for Gitea SSH keys)
 dashboard.resync_all_sshkeys_success = All public keys have been rewritten successfully.
 dashboard.resync_all_hooks = Resync pre-receive, update and post-receive hooks of all repositories.
 dashboard.resync_all_hooks_success = All repositories' pre-receive, update and post-receive hooks have been resynced successfully.