* Docs: Add additional capitalization rules

What this PR does / why we need it:

This updates the Documentation style guide to include more details on the capitalization rules. Capitalization rules get confused easily, especially between terms like Dashboards (menu title) and dashboards (plural).

Which issue(s) this PR fixes:

No fix, just an addition.

* Revert "Docs: Add additional capitalization rules"

This reverts commit 75cbc6303c9f77997b5fd8d26e48802e8e7a859e.

* Docs: Docs: Add additional capitalization rules

* Docs: Simplify headings and make active #19268