Normalize the `BUILD` file licenses comments.

PiperOrigin-RevId: 271416217

tensorflow_federated/python/research/analytics/BUILD

 package(default_visibility = ["//visibility:private"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 exports_files(
     srcs = ["wordcount.ipynb"],

tensorflow_federated/python/research/baselines/emnist/BUILD

 package(default_visibility = ["//tensorflow_federated/python/research"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "models",

tensorflow_federated/python/research/robust_aggregation/BUILD

 package(default_visibility = ["//visibility:private"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "robust_federated_aggregation",

tensorflow_federated/python/research/semi_cyclic_sgd/BUILD

 package(default_visibility = ["//visibility:private"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_binary(
     name = "cyclic_bag_log_reg",

tensorflow_federated/python/research/simple_fedavg/BUILD

 package(default_visibility = ["//visibility:private"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "simple_fedavg",

tensorflow_federated/python/research/utils/BUILD

 package(default_visibility = ["//tensorflow_federated/python/research"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "checkpoint_utils",

tensorflow_federated/python/simulation/BUILD

 package(default_visibility = ["//tensorflow_federated:__subpackages__"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "simulation",

tensorflow_federated/python/simulation/datasets/BUILD

 package(default_visibility = ["//tensorflow_federated:__subpackages__"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "datasets",

tensorflow_federated/python/simulation/models/BUILD

 package(default_visibility = ["//tensorflow_federated:__subpackages__"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "models",

tensorflow_federated/python/tensorflow_libs/BUILD

 package(default_visibility = ["//tensorflow_federated:__subpackages__"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])
 
 py_library(
     name = "tensorflow_libs",

tensorflow_federated/tools/development/BUILD

 package(default_visibility = ["//visibility:private"])
 
-licenses(["notice"])  # Apache 2.0 License
+licenses(["notice"])
 
 # The data labels are needed otherwise Bazel will not know about the
 # `__init__.py` files; this is because the modules are imported directory,

third_party/BUILD

 package(default_visibility = ["//visibility:private"])
 
-licenses(["notice"])  # Apache 2.0
+licenses(["notice"])

third_party/six.BUILD

 package(default_visibility = ["//visibility:public"])
 
-licenses(["notice"])  # MIT
+licenses(["notice"])
 
 filegroup(
     name = "LICENSE",

third_party/zlib.BUILD

 package(default_visibility = ["//visibility:public"])
 
-licenses(["notice"])  # BSD/MIT-like license (for zlib)
+licenses(["notice"])
 
 cc_library(
     name = "zlib",