[5.3] Augment the page header class in article

[chmst]

Pull Request for Issue #42739 .

Summary of Changes

Change classes for <div class="page-header">
to

<div class="page-header menu">
<div class="page-header article">

Testing Instructions

see #42739, inspect the source code before and after patch

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

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

[fgsw]

I have tested this item ✅ successfully on 6cc6bb4

Before applying this Pull Request	After applying this Pull Request

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[ChristineWk]

I have tested this item ✅ successfully on 6cc6bb4

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[Quy]

RTC

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