Fixed latest coding style issues and refined a few PHP doc entries to match types #677
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This PR fixes latest coding styles reported by PHP-CS-Fixer.
I also made some refinements to match related types.
For instance: https://github.com/smalot/pdfparser/pull/677/files#diff-499d4590ba9258e82e6b727977a0e386991690bb3794522e90f6286e001a2d70L46
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