Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/frc971/control_loops/profiled_subsystem.h b/frc971/control_loops/profiled_subsystem.h
index 2a15201..7a0b7fa 100644
--- a/frc971/control_loops/profiled_subsystem.h
+++ b/frc971/control_loops/profiled_subsystem.h
@@ -18,8 +18,7 @@
 #include "frc971/zeroing/pot_and_index.h"
 #include "frc971/zeroing/zeroing.h"
 
-namespace frc971 {
-namespace control_loops {
+namespace frc971::control_loops {
 
 // TODO(Brian): Use a tuple instead of an array to support heterogeneous zeroing
 // styles.
@@ -466,7 +465,6 @@
       internal::UseUnlessZero(max_angular_acceleration, default_acceleration_));
 }
 
-}  // namespace control_loops
-}  // namespace frc971
+}  // namespace frc971::control_loops
 
 #endif  // FRC971_CONTROL_LOOPS_PROFILED_SUBSYSTEM_H_