Update documentation

Author: amotl

docs/backlog.md

@@ -1,7 +1,3 @@
 # grafana-client backlog
 
-- `python -m pep517.build --source --binary --out-dir dist/ .`
-  pep517.build is deprecated. Consider switching to https://pypi.org/project/build/
-- Format code with `black` and `isort``
 - Clarify *"To use admin API you need to use basic auth"*, see README.
-- Check contents of PyPI package vs. `MANIFEST.in`