[5.2] Clarify Cache Plugin

[brianteeman]

Adds the highlighted text to the description of the page cache plugin in a perhaps feeble attempt to better explain why it probably is not what the user wants to enable.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[Quy]

I have tested this item ✅ successfully on c248a63

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[viocassel]

I have tested this item ✅ successfully on c248a63

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43378.}

[Quy]

RTC

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[pe7er]

Thanks @brianteeman !

[brianteeman]

thanks