[Clustering] Fix error message in clustering_registry.py

Fix typo for get_clustering_impl()

Author: aksh98md

tensorflow_model_optimization/python/core/clustering/keras/clustering_registry.py

@@ -233,15 +233,15 @@ def get_clustering_impl(cls, layer, weight_name):
       raise ValueError(
           "Class {given_class} has not been registered in the "
           "ClusteringLookupRegistry. Use ClusteringLookupRegistry."
-          "register_new_implemenetation to fix this.".format(
+          "register_new_implementation to fix this.".format(
               given_class=layer.__class__
           )
       )
     if weight_name not in cls._LAYERS_RESHAPE_MAP[layer.__class__]:
       raise ValueError(
           "Weight with the name '{given_weight_name}' for class {given_class} "
           "has not been registered in the ClusteringLookupRegistry. Use "
-          "ClusteringLookupRegistry.register_new_implemenetation "
+          "ClusteringLookupRegistry.register_new_implementation "
           "to fix this.".format(
               given_class=layer.__class__,
               given_weight_name=weight_name