Markdown linter (#5494)

* linter

* Add markdown linter

* add env

* only check markdown

* Add token

* Update .github/workflows/test-suite.yml

* Markdown linter

* Exit code

* Update script

* rename

* mdlint

* Add an empty line after end of file

* Testing disable

* add text

* update mdlint.sh

* ori validator inclusion

* Add config yml file

* Remove MD041 and fix advanced-datadir file

* FIx validator inclusion file conflict

* Merge branch 'unstable' into markdown-linter

* change files

* Merge branch 'markdown-linter' of https://github.com/chong-he/lighthouse into markdown-linter

* mdlint

* Remove MD025

* Remove MD036

* Remove MD045

* Removr MD001

* Set MD028 to false

* Remove MD024

* Remove MD055

* Remove MD029

* Remove MD040

* Set MD040 to false

* Set MD033 to false

* Set MD013 to false

* Rearrange yml file

* Update mdlint.sh and test

* Test remove fix

* Test with fix

* Test with space

* Fix summary indentation

* Test mdlint.sh

* Update mdlint.sh

* Test

* Update

* Test fix

* Test again

* Fix

* merge into check-code

* Update scripts/mdlint.sh

Co-authored-by: Mac L <mjladson@pm.me>

* Update scripts/mdlint.sh

Co-authored-by: Mac L <mjladson@pm.me>

* Remove set -e

* Add comment

* Merge pull request #7 from chong-he/unstable

Merge unstable to markdown branch

* mdlint

* Merge branch 'unstable' into markdown-linter

* mdlint

book/src/advanced_metrics.md

@@ -30,7 +30,6 @@ curl localhost:5054/metrics
 
 ## Validator Client Metrics
 
-
 By default, these metrics are disabled but can be enabled with the `--metrics`
 flag. Use the `--metrics-address`, `--metrics-port` and
 `--metrics-allow-origin` flags to customize the metrics server.
@@ -78,7 +77,7 @@ You can adjust the frequency at which Lighthouse sends metrics to the remote ser
 `--monitoring-endpoint-period` flag. It takes an integer value in seconds, defaulting to 60
 seconds.
 
-```
+```bash
 lighthouse bn --monitoring-endpoint-period 60 --monitoring-endpoint "https://url"
 ```