doc: rewrite apply?, exact?, rw? and by? docstrings - #15008
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This PR rewrites the docstrings for the `apply?`, `exact?` and `rw?` tactics, and the `by?` elaborator to reflect [the tactic documentation guidelines](https://github.com/leanprover/lean4/blob/master/doc/style.md#tactics). In particular: * the docstrings for `apply?` and `exact?` now resemble each other better, and explain more of their differences. * the docstring for `rw?` mentions the `rw? at loc` alternative form. * general reformatting and rephrasing.
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This PR rewrites the docstrings for the
apply?,exact?andrw?tactics, and theby?elaborator to reflect the tactic documentation guidelines. In particular:apply?andexact?now resemble each other better, and explain more of their differences.rw?mentions therw? at localternative form.by?term elaborator no longer calls itself a command.