Hi, thanks for the suggestion, but I don't think we will change this.
"while (pred item) returns logical true" is sufficient - "while" means "during the time when the condition holds" (and not when it doesn't). "I sing while I'm in the shower" does not need to also say "and stop singing when I get out of the shower".
Clojure core docstrings are intentionally very economical in their language. They are of course imperfect and nearly every release of Clojure has docstring updates, so we're open to changing them where that makes sense, but I don't think that's the case here.
Many beginners need additional information and we have great ancillary resources like https://clojuredocs.org/clojure.core/take-while where Clojure users can provide examples, additional commentary, links, etc to supplement the core docstring. The Clojure cheatsheet (https://clojure.org/api/cheatsheet) provides links into ClojureDocs as well.