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/y2024_defense/constants.h b/y2024_defense/constants.h
index 7e359f4..d9631d7 100644
--- a/y2024_defense/constants.h
+++ b/y2024_defense/constants.h
@@ -12,8 +12,7 @@
 #include "frc971/zeroing/pot_and_absolute_encoder.h"
 #include "y2024_defense/control_loops/drivetrain/drivetrain_dog_motor_plant.h"
 
-namespace y2024_defense {
-namespace constants {
+namespace y2024_defense::constants {
 
 constexpr uint16_t kTeamNumber = 9972;
 
@@ -60,7 +59,6 @@
 // Calls MakeValues with aos::network::GetTeamNumber()
 Values MakeValues();
 
-}  // namespace constants
-}  // namespace y2024_defense
+}  // namespace y2024_defense::constants
 
 #endif  // Y2023_CONSTANTS_H_
diff --git a/y2024_defense/control_loops/drivetrain/drivetrain_base.h b/y2024_defense/control_loops/drivetrain/drivetrain_base.h
index 622de4f..776ec93 100644
--- a/y2024_defense/control_loops/drivetrain/drivetrain_base.h
+++ b/y2024_defense/control_loops/drivetrain/drivetrain_base.h
@@ -3,15 +3,11 @@
 
 #include "frc971/control_loops/drivetrain/drivetrain_config.h"
 
-namespace y2024_defense {
-namespace control_loops {
-namespace drivetrain {
+namespace y2024_defense::control_loops::drivetrain {
 
 const ::frc971::control_loops::drivetrain::DrivetrainConfig<double> &
 GetDrivetrainConfig();
 
-}  // namespace drivetrain
-}  // namespace control_loops
-}  // namespace y2024_defense
+}  // namespace y2024_defense::control_loops::drivetrain
 
 #endif  // Y2023_CONTROL_LOOPS_DRIVETRAIN_DRIVETRAIN_BASE_H_