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Update Formula-Cookbook.md gsub! example

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The use of a naked expression will trigger errors from `brew audit` so use instead parenthesis around the parameters as per its recommendation and to avoid ambiguous syntax.
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Carlo Marcelo Arenas Belón 2021-10-19 13:20:16 -07:00 committed by GitHub
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@ -441,7 +441,7 @@ inreplace "path", before, after
```ruby
inreplace "path" do |s|
s.gsub! /foo/, "bar"
s.gsub!(/foo/, "bar")
s.gsub! "123", "456"
end
```