[Docs] Minor improvements to `adding_params.md`

[Olshansk]

Summary

The default list of docusaurus syntax highlighting did not include some (e.g. makefile, gherkin, json) languages that we are using.

These are available in the complete list but simply had to be enabled in the config.

Also, minor edits & nits for readability.

Type of change

Select one or more:

• [ ] New feature, functionality or library
• [ ] Bug fix
• [ ] Code health or cleanup
• [x] Documentation
• [ ] Other (specify)

Testing

• [x] make docusaurus_start; only needed if you make doc changes

[github-actions[bot]]

The CI will now also run the e2e tests on devnet, which increases the time it takes to complete all CI checks.

You may need to run make trigger_ci to submit an empty commit that'll trigger the tests.

GCP workloads (requires changing the namespace to 623)) Grafana network dashboard for devnet-issue-{issue-id}