[4.2] ExtensionManagerTrait.php. Comments cosmetic.

[GHSVS-de]

Summary of Changes

Only in some comment lines:

• Removed double "to".
• Changed "module" to "plugin" in bootPlugin()

Testing Instructions

Code review.

[brianteeman]

I have tested this item ✅ successfully on 826988a

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[alikon]

I have tested this item ✅ successfully on 826988a

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[alikon]

rtc

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[Quy]

Thank you.