Prepare for release v1.0.0-rc1800 (#1197)

Author: shsms

RELEASE_NOTES.md

@@ -1,18 +1,10 @@
 # Frequenz Python SDK Release Notes
 
-## Summary
-
-<!-- Here goes a general summary of what this release is about -->
-
 ## Upgrading
 
 - The `microgrid.new_*_pool` methods no longer accept a `set_operating_point` parameter.
 - The power manager now uses a new algorithm described [here](https://frequenz-floss.github.io/frequenz-sdk-python/v1.0-dev/user-guide/microgrid-concepts/#frequenz.sdk.microgrid--setting-power).
 
-## New Features
-
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
 ## Bug Fixes
 
 - Fix `MetricFetcher` leaks when a requested metric fetcher already existed.