changelog feedback (#3913)

* changelog feedback

* fixup

Author: Chris Elion

com.unity.ml-agents/CHANGELOG.md

@@ -23,15 +23,15 @@ and this project adheres to
   communication between Unity and the Python process. (#3760)
 - The obsolete `Agent` methods `GiveModel`, `Done`, `InitializeAgent`,
   `AgentAction` and `AgentReset` have been removed. (#3770)
-- The SideChannel API has changed (#3833, #3660) :
+- The SideChannel API has changed:
   - Introduced the `SideChannelManager` to register, unregister and access side
-    channels.
+    channels. (#3807)
   - `Academy.FloatProperties` was replaced by `Academy.EnvironmentParameters`.
     See the [Migration Guide](https://github.com/Unity-Technologies/ml-agents/blob/master/docs/Migrating.md)
-    for more details on upgrading.
+    for more details on upgrading. (#3807)
   - `SideChannel.OnMessageReceived` is now a protected method (was public)
   - SideChannel IncomingMessages methods now take an optional default argument,
-    which is used when trying to read more data than the message contains.
+    which is used when trying to read more data than the message contains. (#3751)
   - Added a feature to allow sending stats from C# environments to TensorBoard
     (and other python StatsWriters). To do this from your code, use
     `Academy.Instance.StatsRecorder.Add(key, value)`. (#3660)
@@ -46,15 +46,16 @@ and this project adheres to
 - `WriteAdapter` was renamed to `ObservationWriter`. If you have a custom
   `ISensor` implementation, you will need to change the signature of its
   `Write()` method. (#3834)
-- Updated to Barracuda 0.7.0-preivew which has breaking namespace and assembly
-  name changes. (#3875)
+- The Barracuda dependency was upgraded to 0.7.0-preview (which has breaking
+  namespace and assembly name changes). (#3875)
 
 #### ml-agents / ml-agents-envs / gym-unity (Python)
 
 - The `--load` and `--train` command-line flags have been deprecated. Training
-  now happens by default, and use `--resume` to resume training instead. (#3705)
+  now happens by default, and use `--resume` to resume training instead of
+  `--load`. (#3705)
 - The Jupyter notebooks have been removed from the repository. (#3704)
-- Removed the multi-agent gym option from the gym wrapper. For multi-agent
+- The multi-agent gym option was removed from the gym wrapper. For multi-agent
   scenarios, use the [Low Level Python API](https://github.com/Unity-Technologies/ml-agents/blob/master/docs/Python-API.md). (#3681)
 - The low level Python API has changed. You can look at the document
   [Low Level Python API](https://github.com/Unity-Technologies/ml-agents/blob/master/docs/Python-API.md)
@@ -80,7 +81,7 @@ and this project adheres to
 - Academy.InferenceSeed property was added. This is used to initialize the
   random number generator in ModelRunner, and is incremented for each
   ModelRunner. (#3823)
-- Added `Agent.GetObservations()`, which returns a read-only view of the
+- `Agent.GetObservations()` was added, which returns a read-only view of the
   observations added in `CollectObservations()`. (#3825)
 - `UnityRLCapabilities` was added to help inform users when RL features are
   mismatched between C# and Python packages. (#3831)
@@ -118,7 +119,7 @@ and this project adheres to
 
 #### ml-agents / ml-agents-envs / gym-unity (Python)
 
-- Fixed an issue where exceptions from environments provided a returncode of 0.
+- Fixed an issue where exceptions from environments provided a return code of 0.
   (#3680)
 - Self-Play team changes will now trigger a full environment reset. This
   prevents trajectories in progress during a team change from getting into the