Add configuration to requests instrumentation readme

[lmolkova]

Description

Added steps to enable requests instrumentation (currently one has to look to integration tests to see how it has to be done)

Type of change

• This change requires a documentation update

How Has This Been Tested?

created sample app and saw requests instrumentation tracking span

Does This PR Require a Core Repo Change?

• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[codeboten]

Thanks for the PR!

Normally the docs for this would be available here: https://opentelemetry-python-contrib.readthedocs.io/en/latest/instrumentation/requests/requests.html and look something like https://opentelemetry-python-contrib.readthedocs.io/en/latest/instrumentation/redis/redis.html. This is not working currently because of #552.

[lmolkova]

@codeboten thanks for the review and the context! Do I have to update changelog to make pipeline happy?

[codeboten]

@codeboten thanks for the review and the context! Do I have to update changelog to make pipeline happy?

Nope, looks like @lonewolf3739 already added the skip changelog label, should be good to go.

[lzchen]

This isn't really consistent with the documentation for the rest of our instrumentations (the Configuration sections in django and flask pertains to actual configuration rather than usage). How to use the instrumentations are shown in the docstrings instead.

[lmolkova]

This isn't really consistent with the documentation for the rest of our instrumentations (the Configuration sections in django and flask pertains to actual configuration rather than usage). How to use the instrumentations are shown in the docstrings instead.

Ah, I see. the docstrings are not published because of the issue mentioned above.
Should we abandon the idea of having a basic setup in readme.md then? There are other instrumentations (aiohttp client) which has an example in the readme.