Expand documentation for Hash#slice!

[6temes]

Summary

Expand the documentation for slice! method in order to make explicit what it really does.

Taking ActiveSuport::Multibyte as example.

rails/activesupport/lib/active_support/multibyte/chars.rb

Line 96 in 4800fd0

# Works like <tt>String#slice!</tt>, but returns an instance of

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