Motivation
Currently, the explanation of the deepcategory keyword is misleading: It suggests that only 5 subcatagories will be searched through, whereas it actually searches through 5 subcategory levels. See the first bullet point below "Be aware of the following"

Acceptance Criteria

• In the help pop up for "Pages in these categories", replace the sentence Only the first 5 subcategories will be considered in your search. with` Only the first 5 subcategory levels will be included in your search.`

Original ticket description

I was trying to figure out how the "Pages in these categories" search operates, so read the pop-up Help panel (see screenshot below). The instructions say "Only the first 5 subcategories will be considered in your search."

I debated the meaning of this with colleagues in the office; most thought it meant exactly what it says—that only 5 subcategories will be included in the search. However, a look at the Help doc for Searching Wikipedia makes clear that that is not the meaning. The doc says "The depth of the tree is currently limited to 5 levels" [emphasis added].

To make the help panel clearer for English speakers, I suggest you change the wording as follows: "Only the first 5 subcategory levels will be included in your search."