Clean up release notes

Signed-off-by: cwasicki <[email protected]>

Author: cwasicki

RELEASE_NOTES.md

@@ -2,11 +2,6 @@
 
 ## Summary
 
-This is the initial release of the Frequenz Client Common Library.
-It provides wrappers around the types from Frequenz's common API protobuf definitions.
-This version contains types to support pagination in gRPC requests
-and enum types for components and metrics to be used in a microgrid.
-
 <!-- Here goes a general summary of what this release is about -->
 
 ## Upgrading