Removed non-phpdoc @internal tags
Merge pull request #744 from acrobat/internal-doc-fix

Removed non-phpdoc @internal tags
minor phpdoc fixes in the platform files
Merge pull request #746 from acrobat/platform-phpdoc-fixes

minor phpdoc fixes in the platform files
minor phpdoc fixes in the remaining files after pr #746
Merge pull request #747 from acrobat/schema-phpcs-fixes

minor phpdoc fixes in the schema files