(chore): updating and cleaning parametric.md

[rachelyangdog]

Motivation

updating and cleaning parametric markdown file.

Changes

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes (if something not related to your task is failing, you can ignore it)
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner. We're working on refining the codeowners file quickly.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• If PR title starts with [<language>], double-check that only <language> is impacted by the change
• No system-tests internal is modified. Otherwise, I have the approval from R&P team
• CI is green, or failing jobs are not related to this change (and you are 100% sure about this statement)
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added (or removed)?
  • Get a review from R&P team

[robertomonteromiguel]

There are lint failures

[ZStriker19]

Suggested change

	- Shared Tests in Python: We write shared test cases using Python's pytest framework. These tests are designed to be generic and interact with clients through the HTTP interface.
	- Shared Tests in Python: We write shared test cases using Python's pytest framework. These tests are designed to be generic and interact with the tracers through an HTTP interface.

[ZStriker19]

Can we maybe use the word "tracer" instead of "client" here and below? I feel like client is so obscure.

[ZStriker19]

In general, I just want users to understand that the methods written in test code to generate trace data make an outgoing http request through an Http client to an http server. On the http server the tracer is running and we carry out various operations with the tracer (e.g. generating spans, or adding tags) depending on which endpoints you hit and what values are passed in to the outgoing request.

From there we have two ways to check that the logic was carried out as expected, getting spans from the testagent (should provide example probably?) or looking at the value returned by the http server (example would also probably be helpful.)