Improve docs for telemetry completeness tests (#3794)

docs/edit/runbook.md

@@ -19,6 +19,7 @@ The impact is that these **configs are not visible** in Metabase, REDAPL, or any
 1. Check the test failure to see exactly which configs are missing
 2. Add config normalization rules [here](https://github.com/DataDog/dd-go/tree/prod/trace/apps/tracer-telemetry-intake/telemetry-payload/static/) following the existing pattern
    1. This can be merged with any review from [@apm-ecosystems](https://github.com/orgs/DataDog/teams/apm-ecosystems)
+   2. Bonus Points: Run the auto-formatter [_format.py](https://github.com/DataDog/dd-go/blob/prod/trace/apps/tracer-telemetry-intake/telemetry-payload/static/_format.py) from the `dd-go` root via `python ./trace/apps/tracer-telemetry-intake/telemetry-payload/static/_format.py`
 3. After merging, update system-tests by running [update.sh](/tests/telemetry_intake/update.sh)
    1. This can be run from the root by running `./tests/telemetry_intake/update.sh`
    2. This can be merged with any review from [@apm-ecosystems](https://github.com/orgs/DataDog/teams/apm-ecosystems)

tests/test_telemetry.py

@@ -674,7 +674,7 @@ def is_key_accepted_by_telemetry(key, allowed_keys, allowed_prefixes):
                 if len(missing_config_keys) != 0:
                     logger.error(json.dumps(missing_config_keys, indent=2))
                     raise ValueError(
-                        "(NOT A FLAKE) Found unexpected config telemetry keys. Runbook: https://github.com/DataDog/system-tests/blob/main/docs/edit/runbook.md#test_config_telemetry_completeness"
+                        "(NOT A FLAKE) Read this quick runbook to update allowed configs: https://github.com/DataDog/system-tests/blob/main/docs/edit/runbook.md#test_config_telemetry_completeness"
                     )
 
     @missing_feature(library="cpp")