[BUG] Unable to mark markdown code blocks ignored

[barlock]

Describe the bug
With a markdown code block that a secret is detected in. I'm unable to ignore the code block (and not affect the documentation).

To Reproduce
Steps to reproduce the behavior:

1. Add the following to a markdown file

   ```bash
   export ARTIFACTORY_API_KEY="<From above>"
   export ARTIFACTORY_USER="[email protected]"
   
   # 👇 the `\` is to allow github to render a markdown code block inside another 
   # code block. It would be deleted in the test
   \```

2. Run pre-commit
3. See the error

   Secret Type: Secret Keyword
   Location:    docs/index.md:16
   

4. There's no way to mark the line with ARTIFACTORY_API_KEY as allowed without changing how the documentation renders.

Expected behavior
There should be a way to ignore this false positive without ignoring the whole file.

Impact
Medium. I have to ignore the whole file instead of a single line

Additional context:

• Operating System, MacOs
• Languages scanned etc; Markdown

[mjdavisibm]

I am having a similar issue, with markdown. I can not seem to find a way to put a comment in markdown.
e.g.

# Documentation

| Attribute | Where to look |
| ---| ---|                                            
| password                 | Secret: `mas-mongo-ce-admin-admin`->`password`           | 
| CA certificate           | ConfigMap: `mas-mongo-ce-cert-map`                              | 
| TLS Certificate          | Secret: `mas-mongo-ce-cert-secret`->`tls.crt`                   | 

running pre-commit gives

[INFO] Stashing unstaged files to /Users/matt/.cache/pre-commit/patch1670533655-25798.
Detect secrets...........................................................Failed
- hook id: detect-secrets
- exit code: 1

Potential secrets about to be committed to git repo! Please rectify.

Secret Type: Secret Keyword
Location:    MongoDB Enterprise.md:5

Secret Type: Secret Keyword
Location:    MongoDB Enterprise.md:7

Possible mitigations:

  - Mark false positives with an inline `pragma: allowlist secret`
    comment
  - Commit with `--no-verify` if this is a one-time false positive

If a secret has already been committed, visit
https://help.github.com/articles/removing-sensitive-data-from-a-
repository

[INFO] Restored changes from /Users/matt/.cache/pre-commit/patch1670533655-25798.

[bigpick]

This should be covered via the --exclude-lines CLI argument; by doing an --exclude-lines "export ARTIFACTORY_API_KEY=\"<From above>\"" now,

cat issue7/test.md

```bash
export ARTIFACTORY_API_KEY="<From above>"
export ARTIFACTORY_USER="[email protected]"

# 👇 the `\` is to allow github to render a markdown code block inside another
# code block. It would be deleted in the test
\```

detect-secrets scan --update .secrets.baseline --exclude-lines "export ARTIFACTORY_API_KEY=\"<From above>\"" --all-files issue7

detect-secrets audit .secrets.baseline
Nothing to audit!