Update docs

(cherry picked from commit fe75e1b)

Author: deliahu

docs/applications/implementations/aggregators.md

@@ -22,7 +22,7 @@ def aggregate_spark(data, input):
     pass
 ```
 
-See Cortex's built-in <!-- CORTEX_VERSION_MINOR -->[`aggregators`](https://github.com/cortexlabs/cortex/blob/0.4/pkg/aggregators)) for example implementations.
+See Cortex's built-in <!-- CORTEX_VERSION_MINOR -->[aggregators](https://github.com/cortexlabs/cortex/blob/0.4/pkg/aggregators) for example implementations.
 
 ## Example
 

docs/applications/implementations/estimators.md

@@ -28,7 +28,7 @@ def create_estimator(run_config, model_config):
 
 See the [tf.estimator.RunConfig](https://www.tensorflow.org/api_docs/python/tf/estimator/RunConfig) and [tf.estimator.Estimator](https://www.tensorflow.org/api_docs/python/tf/estimator/Estimator) documentation for more information.
 
-See Cortex's built-in <!-- CORTEX_VERSION_MINOR -->[`estimators`](https://github.com/cortexlabs/cortex/blob/0.4/pkg/estimators)) for example implementations.
+See Cortex's built-in <!-- CORTEX_VERSION_MINOR -->[estimators](https://github.com/cortexlabs/cortex/blob/0.4/pkg/estimators) for example implementations.
 
 ## Example
 

docs/applications/implementations/transformers.md

@@ -65,7 +65,7 @@ def reverse_transform_python(transformed_value, input):
     pass
 ```
 
-See Cortex's built-in <!-- CORTEX_VERSION_MINOR -->[`transformers`](https://github.com/cortexlabs/cortex/blob/0.4/pkg/transformers)) for example implementations.
+See Cortex's built-in <!-- CORTEX_VERSION_MINOR -->[transformers](https://github.com/cortexlabs/cortex/blob/0.4/pkg/transformers) for example implementations.
 
 ## Example