Update CHANGELOG.md

Author: ananthsub

CHANGELOG.md

@@ -166,6 +166,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Added support for `torch.use_deterministic_algorithms` ([#9121](https://github.com/PyTorchLightning/pytorch-lightning/pull/9121))
 
 
+- Added `enable_model_summary` flag to Trainer ([#9699](https://github.com/PyTorchLightning/pytorch-lightning/pull/9699))
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 ### Changed
 
 - `pytorch_lightning.loggers.neptune.NeptuneLogger` is now consistent with new [neptune-client](https://github.com/neptune-ai/neptune-client) API ([#6867](https://github.com/PyTorchLightning/pytorch-lightning/pull/6867)).
@@ -296,7 +299,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Deprecated Accelerator collective API `barrier`, `broadcast`, and `all_gather`, call `TrainingTypePlugin` collective API directly ([#9677](https://github.com/PyTorchLightning/pytorch-lightning/pull/9677))
 
 
-- Deprecated passing `weights_summary` to the `Trainer` constructor in favor of adding the `ModelSummary` callback with `max_depth` directly to the list of callbacks ([#9616](https://github.com/PyTorchLightning/pytorch-lightning/pull/9616))
+- Deprecated passing `weights_summary` to the `Trainer` constructor in favor of adding the `ModelSummary` callback with `max_depth` directly to the list of callbacks ([#9699](https://github.com/PyTorchLightning/pytorch-lightning/pull/9699))
 
 
 ### Removed