[com_newsfeeds] Coding standards form xml + correction wrong closing tags

[cyrezdev]

Code standards (https://joomla.github.io/coding-standards/?coding-standards/chapters/xml.md) + correction closing tags, form xml files com_newsfeeds

Summary of Changes

config.xml

• Code standards
• Add emtpy line before each opening tag (readability)
• Fix mix space/tabs for a few indents

newsfeeds.xml

• Remove extra empty line at end of xml file

models/forms/newsfeed.xml

• Code standards
• Add emtpy line before each opening tag (readability)
• Fix wrong field closing tags : catid & tags

models/forms/filter_newsfeeds.xml

• Add emtpy line before each opening tag (readability)

Testing Instructions

• code review
• apply and test all is working as before

[andrepereiradasilva]

I have tested this item ✅ successfully on d3e1309

on code review

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