[apm] Update content related to mobile APM agents for GA#3507

Merged

colleenmcginnis merged 3 commits intoelastic:mainfrom colleenmcginnis:issue-3377

Jan 12, 2024

+169-15

Commits on Jan 4, 2024

first pass at cleaning up apm agent mobile content
colleenmcginnis
committed

Commits on Jan 9, 2024