php: Fix lint warnings

[hfiguiere]

Current lint warning to fix:

FILE: collabora-online-wp/includes/class-collaborautils.php
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FOUND 3 ERRORS AND 2 WARNINGS AFFECTING 3 LINES
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 49 | WARNING | This comment is 58% valid code; is this commented out code?
 49 | ERROR   | Inline comments must end in full-stops, exclamation marks, or question marks
 57 | ERROR   | Empty CATCH statement detected
 58 | WARNING | This comment is 54% valid code; is this commented out code?
 58 | ERROR   | Inline comments must end in full-stops, exclamation marks, or question marks
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FILE: collabora-online-wp/includes/class-collaborawopi.php
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FOUND 1 ERROR AND 1 WARNING AFFECTING 2 LINES
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 210 | WARNING | This comment is 84% valid code; is this commented out code?
 369 | ERROR   | Inline comments must end in full-stops, exclamation marks, or question marks
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[hfiguiere]

After commit a8822b0
Only one warning left