Summary: If you take a quick glance at the Scripting Documentation you see two components missing from block and item component groups Load UI and Unload UI and their corresponding components but can be found to be used and are working if used in a Java Script based Client or Server Script.

Steps to Reproduce:
1. Download Vanilla Behavior Pack.
2. Read Scripting Documentation.
3. Read Block Documentation.
4. Read Item Documentation.
5. Read Event Documentation.
6. Analyze and Compare Documentations.

Observed Result: Load and Unload UI Component Groups and Components are missing from Events and Item and Block Components or Documentation and Component Groups.

Expected Result: Load and Unload UI Component Groups and Event Components shouldn't be missing from Block and Item and Event Component Groups and Components and Documentation.

Relates To: MCPE-138132