`Resolve in Merge Editor` button shown in accessibility help for merge editor

[chrmarti]

Seeing the following which seems to be the expected help for the merge editor. A bit unexpected but maybe not important for screen reader usage are that the text's lines are not wrapped and the Resolve in Merge Editor button is shown. Will open a new issue for these.

Originally posted by @chrmarti in #227844

[meganrogge]

/duplicate #244770