Update calback page (keras-team#6289)

Author: nzw0301

docs/templates/callbacks.md

@@ -36,7 +36,7 @@ class LossHistory(keras.callbacks.Callback):
         self.losses.append(logs.get('loss'))
 
 model = Sequential()
-model.add(Dense(10, input_dim=784, init='uniform'))
+model.add(Dense(10, input_dim=784, kernel_initializer='uniform'))
 model.add(Activation('softmax'))
 model.compile(loss='categorical_crossentropy', optimizer='rmsprop')
 
@@ -58,7 +58,7 @@ print history.losses
 from keras.callbacks import ModelCheckpoint
 
 model = Sequential()
-model.add(Dense(10, input_dim=784, init='uniform'))
+model.add(Dense(10, input_dim=784, kernel_initializer='uniform'))
 model.add(Activation('softmax'))
 model.compile(loss='categorical_crossentropy', optimizer='rmsprop')
 

keras/callbacks.py

@@ -578,7 +578,7 @@ class TensorBoard(Callback):
     tensorboard --logdir=/full_path_to_your_logs
     ```
     You can find more information about TensorBoard
-    [here](https://www.tensorflow.org/versions/master/how_tos/summaries_and_tensorboard/index.html).
+    [here](https://www.tensorflow.org/get_started/summaries_and_tensorboard).
 
     # Arguments
         log_dir: the path of the directory where to save the log