[Docs] Suggestion for doc page on "Pages Dropdown" field of Theme Settings API

[candidexmedia]

Hi Publii team!

Just a quick suggestion for the Pages Dropdown | Theme Settings API docs page:

The "Posts Dropdown" page mentions the following at the end:

The posts dropdown returns the ID/s of the selected post/s as a value, so it should be connected with the use of the getPost or getPosts helper. If the multiple option is set to true, then a string with IDs separated by commas is returned.

I think a similar note should be added for the Pages Dropdown page, with a link to its respective helpers:

The posts dropdown returns the ID/s of the selected post/s as a value, so it should be connected with the use of the getPage or getPages helper. If the multiple option is set to true, then a string with IDs separated by commas is returned.

I wasted quite some time using the wrong helper, because I thought the posts/pages helpers were interchangeable (since the Posts Dropdown docs page didn't mention the helpers). 🤦🏿‍♀️

[bobmitro]

updated.