Fix typo in kernel path

Author: mcbarton

CMakeLists.txt

@@ -154,7 +154,7 @@ endfunction()
 message("Configure kernels: ...")
 configure_kernel("/share/jupyter/kernels/xcpp17/")
 configure_kernel("/share/jupyter/kernels/xcpp20/")
-configure_kernel("/share/jupyter/kernels/xccp23/")
+configure_kernel("/share/jupyter/kernels/xcpp23/")
 
 # Source files
 # ============