Fix grammar in release notes (#1040)

Author: shsms

RELEASE_NOTES.md

@@ -6,7 +6,7 @@
 
 ## Upgrading
 
-- The `frequenz.sdk.microgrid.*_pool` methods has been renamed to `new_*_pool`, to make it explicit that they create new instances of the pool classes.
+- The `frequenz.sdk.microgrid.*_pool` methods have been renamed to `new_*_pool`, to make it explicit that they create new instances of the pool classes.
   - `battery_pool` -> `new_battery_pool`
   - `ev_charger_pool` -> `new_ev_charger_pool`
   - `pv_pool` -> `new_pv_pool`
@@ -19,7 +19,7 @@
 
 - Passing a `request_timeout` in calls to `*_pool.propose_power` is no longer supported.  It may be specified at application startup, through the new optional `api_power_request_timeout` parameter in the `microgrid.initialize()` method.
 
-- Power distribution results are no longer available through the `power_status` streams in the `*Pool`s.    They can now be accessed as a stream from a separate property `power_distribution_results`, which is available from all the `*Pool`s.
+- Power distribution results are no longer available through the `power_status` streams in the `*Pool`s.  They can now be accessed as a stream from a separate property `power_distribution_results`, which is available from all the `*Pool`s.
 
 - The `ConfigManagingActor` now uses `collections.abc.Mapping` as the output sender type. This change indicates that the broadcasted configuration is intended to be read-only.
 
@@ -49,13 +49,13 @@
 ## Bug Fixes
 
 - Fixed a typing issue that occurs in some cases when composing formulas with constants.
-- Fixed a bug where sending tasks in the data sourcing actor might have not been properly awaited.
+- Fixed a bug where sending tasks in the data sourcing actor might not have been awaited.
 - Updated the logical meter documentation to reflect the latest changes.
 - Fixed a bug in the code examples in the getting-started tutorial.
 - Fixed a bug in `ConfigManagingActor` that was not properly comparing the event path to the config file path when the config file is a relative path.
 - Re-expose `ComponentMetricId` to the docs.
 - Fixed typing ambiguities when building composite formulas on streaming data.
 - Fixed a bug that was causing the `PowerDistributor` to exit if power requests to PV inverters or EV chargers timeout.
-- Fix handling of cancelled tasks in the data sourcing and resampling actor.
-- Fix PV power distribution excluding inverters that haven't sent any data since startup.
-- Prevent stacking of power requests to avoid delays in processing when the power requests frequency exceeds the processing time.
+- Fix the handling of canceled tasks in the data sourcing and resampling actor.
+- Fix a bug in PV power distribution by excluding inverters that haven't sent any data since startup.
+- Prevent stacking of power requests to avoid delays in processing when the power request frequency exceeds the processing time.