Fix regex in DocumentRenderer.php

[Technicalleigh]

Pull Request for Issue # n/a

Summary of Changes

Fixes a regex to prevent double-slashes in the URLs for intro images used in RSS and Atom feeds

Testing Instructions

In the admin interface of a fresh Joomla installation:

1. Admin: Open Menus > Main Menu and create a new menu item:

• Title: test
• Menu item type: Articles > Category List
• Category: Uncategorised

2. Admin: Create a new article:

• Title: test page
• Content: lorem ipsum
• Intro image: /images/sampledata/cassiopeia/nasa1-1200.jpg

3. Site: Click "test" in the Main Menu
4. View page source to get the RSS or Atom feed URL
5. Download the feed and open it in a text editor

Actual result BEFORE applying this Pull Request

<description><![CDATA[<p><img src="https://example.com//images/sampledata/cassiopeia/nasa1-1200.jpg" alt="" width="1200" height="400" loading="lazy"></p><p>lorem ipsum</p>]]></description>

Expected result AFTER applying this Pull Request

<description><![CDATA[<p><img src="https://example.com/images/sampledata/cassiopeia/nasa1-1200.jpg" alt="" width="1200" height="400" loading="lazy"></p><p>lorem ipsum</p>]]></description>

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

Notes

I couldn't figure out why this happens for the Intro Image but not any other images in an article. I only happened to notice it because the RSS reader I use doesn't try to fix malformed URLs. :) I did some additional testing to ensure my fix doesn't interfere with any other links in the feed -- it looks good to me, but I'm no expert so please check closely.

Thank you for all your work on this project!