Fix more miscellaneous oddities around the class reference

[Mickeon]

Continuation of #95774
See also #89036

This PR addressed yet another huge chunk of class reference oddities I remembered to note down for later while localizing the class reference. Some of these are clear typos, some are inconsistencies, some are just awkward.

I decided to separate this from the original because these may be more prickly.

Of particular note:

• Fix some things that were fixed in Overhaul some "uncommon" wording in class reference #89036 but came back in full force because I cannot be behind every contributor's back.
• PROPERTY_USAGE_CLASS_IS_ENUM called the property an "enum", whereas it's probably closer to an enum type variable, which is less ambiguous.
• Replace the few uses of "acquire", "interrogate", and "augment" with more common verbs.
• Replace leftover references to "spatial node" from 3.x.
• NEVER write "The node (and any relevant children) should be [member CanvasItem.visible]" ever again. I'm going to cry.

For the descriptions affected, not many tweaks have been made this time. Who knows when this will be merged anyway.

[Mickeon]

Updated the PR to replace these random tabulation characters

[Mickeon]

Rebased after minor conflict.

[Repiteo]

Thanks!