AthenaKernel: Fix a typo in comments.

Fix a typo in comments.

This merge request affects 1 package:

• Control/AthenaKernel

This merge request affects 1 file:

• Control/AthenaKernel/AthenaKernel/RCUUpdater.h

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash 541d8323)

	Athena	AthSimulation	AthGeneration	AnalysisBase
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 25449]

merged

mentioned in commit b99bfeeb

added sweep:ignore label