Documentation Update

[LengthenedGradient]

Adds documentation for certain functions related to entity creation.

Please let me know anything I should change.

Annotations follow this format (https://luals.github.io/wiki/annotations/#understanding-this-page)

More documentation should Ideally come later, this is just a stepping stone so I can help clear up how to make entities.

Notes:

• As LuaLS' annotation system does not support an entity type, all entities are stated as tables.
• I noticed there are many functions that are annotated similarly but instead use double dashes instead of single dashes (also lacking types). Unclear if this is the format for an earlier version of LuaLS' annotation functionality, but that may need to be updated in the future.