Theme Check - Update theme-check-common to include doc tag

[jamesmengo]

What are you adding in this PR?

What's next? Any followup issues?

What did you learn?

Before you deploy

• This PR includes a new checks or changes the configuration of a check
  • I included a minor bump changeset
  • It's in the allChecks array in src/checks/index.ts
  • I ran yarn build and committed the updated configuration files
    • If applicable, I've updated the theme-app-extension.yml config

• I included a minor bump changeset
• My feature is backward compatible

• I included a patch bump changeset

[jamesmengo]

• Add 'doc' to TAGS_WITHOUT_MARKUP #637
• Theme Check - Update theme-check-common to include doc tag #636 👈 (View in Graphite)
• Add basic {% doc %} tag parsing support #621 : 2 other dependent PRs (#638 , #646 )
• main

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