[APM] Fix inconsistencies in APM Settings

[sorenlouv]

The title positioning and description is inconsistent between the different sections in settings.

[elasticmachine]

Pinging @elastic/apm-ui (Team:apm)

[ruhci28]

Hye is someone working on this issue .? if not can I tackle .?

[sorenlouv]

Hi @ruhci28

No one is working on this yet. I just realise that it will be much easier to work on when we have a design ready so I've removed the contributor labels.

That being said, you are very welcome to take a crack at it.

[sorenlouv]

@formgeist Should this be moved to the design board?