[patch] Add qualifying language to migrate and schema

[whichking]

Per the (late) PR, [patch] Remove Migrate Setting From Model Settings #1290, the current documentation doesn't express that the migrate and schema model settings can only be set as app-wide defaults. This language has been added to the relevant areas of the Model Settings page.

[sailsbot]

Hi @MadisonHicks! It looks like the title of your pull request doesn’t quite match our guidelines yet. Would you please edit your pull request's title so that it begins with [proposal], [patch], [fixes #<issue number>], [implements #<other PR number>], or [misc]? Once you've edited it, I'll take another look!

[sailsbot]

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[nahanil]

Explains the expletives coming from my desk the other day trying to query across multiple schemas :)