[5.3] Fix wording (#44954)

[tecpromotion]

Pull Request for PR #44954 .

Summary of Changes

It is not the release channel that is changed, but the update channel. The translation is now clearer.

Testing Instructions

.

Actual result BEFORE applying this Pull Request

PLG_EXTENSION_JOOMLAUPDATE_XML_DESCRIPTION="Purges the core updates after release channel changes."

Expected result AFTER applying this Pull Request

PLG_EXTENSION_JOOMLAUPDATE_XML_DESCRIPTION="Purges the core updates after update channel changes."

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

[QuyTon]

I have tested this item ✅ successfully on 21088a0

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[heelc29]

I have tested this item ✅ successfully on 21088a0

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45058.}

[QuyTon]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45058.}