Improve formatting

doc/user/application_security/secret_detection/index.md

@@ -167,12 +167,12 @@ WARNING:
 Beginning in GitLab 13.0, the use of [`only` and `except`](../../../ci/yaml/index.md#only--except)
 is no longer supported. When overriding the template, you must use [`rules`](../../../ci/yaml/index.md#rules) instead.
 
-#### GIT_DEPTH
+#### `GIT_DEPTH` variable
 
 The [`GIT_DEPTH` CI/CD variable](../../../ci/runners/configure_runners.md#shallow-cloning) affects Secret Detection.
 The Secret Detection analyzer relies on generating patches between commits to scan content for
 secrets. If you override the default, ensure the value is greater than 1. If the number of commits
-in an MR is greater than the GIT_DEPTH value, Secret Detection will [fail to detect secrets](#error-couldnt-run-the-gitleaks-command-exit-status-2).
+in an MR is greater than the `GIT_DEPTH` value, Secret Detection will [fail to detect secrets](#error-couldnt-run-the-gitleaks-command-exit-status-2).
 
 #### Custom settings example