A couple weeks ago, I posted about a problem I was having getting RSS to validate because the description element contained HTML markup.
The solution turned out to be as easy as I expected, once I found the right place to look. The first place I went was the Views module, where I found views-view-row-rss.html.twig in the templates directory. "Perfect", I thought, "that's my boy." A quick edit later, followed by a couple cache clears and some head-scratching, I still wasn't seeing my change.