Added global documentation in includes/Plugin_Main.php file

[shail-mehta]

Added missing global documentation for global $context

[github-actions]

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Co-authored-by: shail-mehta <[email protected]>
Co-authored-by: davidperezgar <[email protected]>

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[davidperezgar]

Hello, I appretiate your contribution, but if you feel that there are missing global variables documentation, make one PR for that. Not making for every commit.