fix: add missing known_good parameter to docs() macro table

Author: AlexanderLanin

docs/how-to/setup.md

@@ -71,6 +71,7 @@ The `docs()` macro accepts the following arguments:
 | `data` | List of `needs_json` targets that should be included in the documentation | No |
 | `deps` | Additional Bazel Python dependencies | No |
 | `scan_code` | Source code targets to scan for traceability tags | No |
+| `known_good` | Label to a "known good" JSON file for source links | No |
 | `metamodel` | Label to a custom `metamodel.yaml` that replaces the default metamodel | No |
 
 ### 4. Copy conf.py