Remove frontmatter that is no longer required

doc/api/settings.md

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 # Application settings API
 
 These API calls allow you to read and modify GitLab instance

doc/ci/variables/README.md

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doc/development/architecture.md

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 # GitLab Architecture Overview
 
 ## Software delivery

doc/development/documentation/styleguide.md

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   - List item 2
   ```
 
-### Tables overlapping the TOC
-
-By default, all tables have a width of 100% on docs.gitlab.com.
-In a few cases, the table will overlap the table of contents (ToC).
-For these cases, add an entry to the document's frontmatter to
-render them displaying block. This will make sure the table
-is displayed behind the ToC, scrolling horizontally:
-
-```md
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-```
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 ### Emphasis
 
 - Use double asterisks (`**`) to mark a word or text in bold (`**bold**`).

doc/user/application_security/sast/analyzers.md

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 # SAST Analyzers **(ULTIMATE)**
 
 SAST relies on underlying third party tools that are wrapped into what we call