* src/minibuf.c (Fcompleting_read): Refer to `(elisp)Basic
Completion' in the docstring (bug#21644).
COLLECTION can be a list of strings, an alist, an obarray or a hash table.
COLLECTION can also be a function to do the completion itself.
PREDICATE limits completion to a subset of COLLECTION.
-See `try-completion' and `all-completions' for more details
+See Info node `(elisp)Basic Completion' for more details
on completion, COLLECTION, and PREDICATE.
REQUIRE-MATCH can take the following values: