Commits on Dec 4, 2021

1. Add documentation to more From::from implementations. …

   For users looking at documentation through IDE popups, this gives them
   relevant information rather than the generic trait documentation wording
   “Performs the conversion”. For users reading the documentation for a
   specific type for any reason, this informs them when the conversion may
   allocate or copy significant memory versus when it is always a move or
   cheap copy.
   
   Notes on specific cases:
   * The new documentation for `From<T> for T` explains that it is not a
     conversion at all.
   * Also documented `impl<T, U> Into<U> for T where U: From<T>`, the other
     central blanket implementation of conversion.
   * I did not add documentation to conversions of a specific error type to
     a more general error type.
   * I did not add documentation to unstable code.
   
   This change was prepared by searching for the text "From<... for" and so
   may have missed some cases that for whatever reason did not match. I
   also looked for `Into` impls but did not find any worth documenting by
   the above criteria.

   

   kpreid committed Dec 4, 2021
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