Fix: Correct SAST docs variable groupings

- Move `SAST_DISABLE_BABEL` to analyzer-specific settings
- Move `SEARCH_MAX_DEPTH` to vulnerability filters

doc/user/application_security/sast/index.md

@@ -326,9 +326,9 @@ Some analyzers make it possible to filter out vulnerabilities under a given thre
 | Environment variable          | Default value            | Description                                                                                                                                                                                                                 |
 |-------------------------------|--------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | `SAST_EXCLUDED_PATHS`         | `spec, test, tests, tmp` | Exclude vulnerabilities from output based on the paths. This is a comma-separated list of patterns. Patterns can be globs, or file or folder paths (for example, `doc,spec` ). Parent directories will also match patterns. |
+| `SEARCH_MAX_DEPTH`            | 4                        | Maximum number of directories traversed when searching for source code files. |
 | `SAST_BANDIT_EXCLUDED_PATHS`  |                          | Comma-separated list of paths to exclude from scan. Uses Python's [`fnmatch` syntax](https://docs.python.org/2/library/fnmatch.html); For example: `'*/tests/*, */venv/*'`                                                  |
 | `SAST_BRAKEMAN_LEVEL`         | 1                        | Ignore Brakeman vulnerabilities under given confidence level. Integer, 1=Low 3=High.                                                                                                                                        |
-| `SAST_DISABLE_BABEL`          | `false`                  | Disable Babel processing for the NodeJsScan scanner. Set to `true` to disable Babel processing. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/33065) in GitLab 13.2.                                           |
 | `SAST_FLAWFINDER_LEVEL`       | 1                        | Ignore Flawfinder vulnerabilities under given risk level. Integer, 0=No risk, 5=High risk.                                                                                                                                  |
 | `SAST_GITLEAKS_ENTROPY_LEVEL` | 8.0                      | Minimum entropy for secret detection. Float, 0.0 = low, 8.0 = high.                                                                                                                                                         |
 | `SAST_GOSEC_LEVEL`            | 0                        | Ignore Gosec vulnerabilities under given confidence level. Integer, 0=Undefined, 1=Low, 2=Medium, 3=High.                                                                                                                   |
@@ -371,7 +371,7 @@ Some analyzers can be customized with environment variables.
 | `FAIL_NEVER`                          | SpotBugs             | Set to `1` to ignore compilation failure.                                                                                                                                                                                                  |
 | `SAST_GOSEC_CONFIG`                   | Gosec                | Path to configuration for Gosec (optional).                                                                                                                                                                                                |
 | `PHPCS_SECURITY_AUDIT_PHP_EXTENSIONS` | phpcs-security-audit | Comma separated list of additional PHP Extensions.                                                                                                                                                                                         |
-| `SEARCH_MAX_DEPTH`                    | any                  | Maximum number of directories traversed when searching for source code files. Default: `4`.                                                                                                                                                |
+| `SAST_DISABLE_BABEL`          | NodeJsScan                  | Disable Babel processing for the NodeJsScan scanner. Set to `true` to disable Babel processing. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/33065) in GitLab 13.2.                                           |
 
 #### Custom environment variables