Export of internal Abseil changes

--
bc21467e5507ca041dcd1162cb524d2a01fd17d6 by Abseil Team <absl-team@google.com>:

Fix mistakes in license boilerplate:
- randen_detect.cc had a space removed
- arg_test.cc had a truncated header

PiperOrigin-RevId: 340484448
GitOrigin-RevId: bc21467e5507ca041dcd1162cb524d2a01fd17d6
Change-Id: I654080c9c84f28017384a3f30bcb17d7cf43b881

absl/random/internal/randen_detect.cc

 // Copyright 2017 The Abseil Authors.
 //
-// Licensed under the Apache License, Version 2.0 (the"License");
+// Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an"AS IS" BASIS,
+// distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

absl/strings/internal/str_format/arg_test.cc

@@ -6,6 +6,12 @@
 //
 //      https://www.apache.org/licenses/LICENSE-2.0
 //
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
 #include "absl/strings/internal/str_format/arg.h"
 
 #include <ostream>