(find-doc re-string-or-pattern)
Prints documentation for any var whose documentation or name contains a match for re-string-or-pattern
user=> (find-doc "data structure")
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clojure.core/eval
([form])
Evaluates the form data structure (not text!) and returns the result.
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clojure.core/ifn?
([x])
Returns true if x implements IFn. Note that many data structures
(e.g. sets and maps) implement IFn