Remove obsolete references to licensing from functions-and-operators docs page #22618
Description
Since we changed the way licensing works (throttling vs gatekeeping features), our functions page needs to remove all references to licensing.
Page to be changed: https://www.cockroachlabs.com/docs/stable/functions-and-operators
Some of the functions have the following comment:
This function requires an enterprise license on a CCL distribution.
These sentences can all be removed. There are 9 of them in total.
Jira issue: DOC-16126