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/y2021_bot3/actors/auto_splines.h b/y2021_bot3/actors/auto_splines.h
index 9984c15..9225a49 100644
--- a/y2021_bot3/actors/auto_splines.h
+++ b/y2021_bot3/actors/auto_splines.h
@@ -11,8 +11,7 @@
 
 */
 
-namespace y2021_bot3 {
-namespace actors {
+namespace y2021_bot3::actors {
 
 class AutonomousSplines {
  public:
@@ -22,7 +21,6 @@
       aos::Sender<frc971::control_loops::drivetrain::Goal>::Builder *builder);
 };
 
-}  // namespace actors
-}  // namespace y2021_bot3
+}  // namespace y2021_bot3::actors
 
 #endif  // Y2021_BOT3_ACTORS_AUTO_SPLINES_H_