Remove articles from API endpoint summaries (#5015)

Closes #4741 

The process here was pretty cool. I fed all the lines to GPT-4 and got
it to give me a giant `sed` command to update all the summaries. It had
a couple of issues as written, but I fixed them. Details
[here](https://gist.github.com/david-crespo/b5cd941045dc518a61e1eab1a5d1f50e).
Then I manually went through and tweaked everything.