[PR][php-langspec][#76][master] - Formatting fixes in Grammar

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Newsgroups php.standards
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You can view the Pull Request on github:
https://github.com/php/php-langspec/pull/76

Pull Request Description:
Noticed some changes in #69 were not replicated in the grammar file.

Wasn't sure exactly how to fit in the string variable substitution part but i'll probably address that soon.
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