updated docs

Author: williamFalcon

docs/Trainer/hooks.md

@@ -18,7 +18,7 @@ def on_epoch_start(self):
 ```
 
 ---
-#### on_batch_end
+#### on_epoch_end
 Called in the training loop at the very end of the epoch.   
 ```python
 def on_epoch_end(self):
@@ -33,6 +33,14 @@ def on_batch_start(self):
     # do something when the batch starts
 ```
 
+---
+#### on_batch_end
+Called in the training loop after the batch.   
+```python
+def on_batch_end(self):
+    # do something when the batch ends 
+```
+
 ---
 #### on_pre_performance_check
 Called at the very beginning of the validation loop.