Add section in docs for initializing a tracer (#2481)
Add section in docs for initializing a tracer (#2481)

* Add section in docs for initializing a tracer

* Apply suggestions from code review

Co-authored-by: Anthony Mirabella <bb65d5af60f06ca654295bbce73e2d43310f732e@aneurysm9.com>

* Change weird incomplete sentence

* update some of the bullets to be a tad less opinionated

* Rename section so it's open to different ways to acquire a tracer

* Remove guidance as it is orthogonal

* Apply suggestions from code review

Co-authored-by: Tyler Yahn <b79042b10fd9cd75597e3dac7c4e4fe9e14fe996@users.noreply.github.com>

Co-authored-by: Anthony Mirabella <bb65d5af60f06ca654295bbce73e2d43310f732e@aneurysm9.com>
Co-authored-by: Tyler Yahn <b79042b10fd9cd75597e3dac7c4e4fe9e14fe996@users.noreply.github.com>
open-telemetry/opentelemetry-go,open-telemetry/opentelemetry-go