Update documentation for merge trains and MWPS
What does this MR do and why?
This updates screenshots and a few button names across the documentation for the merge trains and "MWPS" as part of the work for #359057 (closed)
Screenshots or screen recordings
Screenshots are required for UI changes, and strongly recommended for all other merge requests.
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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