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merge revision(s) 53667,57735: [Backport #13148]

    hash.c: exception examples

    * hash.c (rb_hash_dig): [DOC] add examples of exceptions.
    Fix doc for Hash#dig and Struct#dig

    * hash.c (rb_hash_dig): [DOC] correct argument name
      in method description; fix formatting in examples.
    * struct.c (rb_struct_dig): ditto.

    [ruby-core:79221] [Bug #13148]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@58153 b2dd03c8-39d4-4d8f-98ff-823fe69b080e