Finish pages that say "under review"

[milliehartnt123]

Finish the following pages that have the following at the top of the page:

This page is under review. The page is likely incorrect, contains invalid links, and/or needs technical review. In the future it may change substantially or be removed entirely.

• Documentation: Hashes
• Documentation: Functions
• Documentation: Scripting with Lua
• Documentation: Lua API Reference
• Documentation: Administration
• Documentation: Distributed Locks
• Documentation: FAQ
• Documentation: License
• Documentation: History
• Documentation: Diagnosing latency issues