Add backticks around "master" in "master branch"

doc/ci/environments/deployment_safety.md

@@ -71,8 +71,8 @@ runs by enabling the [Skip outdated deployment jobs](../pipelines/settings.md#sk
 
 Example of a problematic pipeline flow **before** enabling Skip outdated deployment jobs:
 
-1. Pipeline-A is created on the master branch.
-1. Later, Pipeline-B is created on the master branch (with a newer commit SHA).
+1. Pipeline-A is created on the `master` branch.
+1. Later, Pipeline-B is created on the `master` branch (with a newer commit SHA).
 1. The `deploy` job in Pipeline-B finishes first, and deploys the newer code.
 1. The `deploy` job in Pipeline-A finished later, and deploys the older code, **overwriting** the newer (latest) deployment.
 

doc/development/contributing/merge_request_workflow.md

@@ -176,7 +176,7 @@ the contribution acceptance criteria below:
    exposing a bug in existing code). Every new class should have corresponding
    unit tests, even if the class is exercised at a higher level, such as a feature test.
    - If a failing CI build seems to be unrelated to your contribution, you can try
-     restarting the failing CI job, rebasing from master to bring in updates that
+     restarting the failing CI job, rebasing from `master` to bring in updates that
      may resolve the failure, or if it has not been fixed yet, ask a developer to
      help you fix the test.
 1. The MR initially contains a few logically organized commits.