Add doc comments about why symbol_short! #1064
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What
Add doc comments about why symbol_short! is preferred over Symbol::short.
Why
The behavior of const functions when called in non-const-contexts is not well known, as has been evidenced by the many times folks have asked why we have symbol_short!, and the case where symbol_short! was removed with folks assuming it was of no use. For example: #1043 (comment). Adding docs to knowledge share.