[ruby-cvs:79095] f74021e12b (master): Improve docs for String#=~

Marcus Stollsteimer	2020-01-09 04:47:10 +0900 (Thu, 09 Jan 2020)

  New Revision: f74021e12b

  https://github.com/ruby/ruby/commit/f74021e12b

  Log:
    Improve docs for String#=3D~
    =

    Move existing example to the corresponding paragraph and
    add an example for `string =3D~ regexp` vs. `regexp =3D~ string`;
    avoid using the receiver's identifier from the call-seq
    because it does not appear in rendered HTML docs;
    mention deprecation of Object#=3D~; fix some markup and typos.

  Modified files:
    string.c=