base: arch_topology: update Kconfig help description

Commit 5d777b185f ("arch_topology: Make cpu_capacity sysfs node as read-only")
made cpu_capacity sysfs node read-only. Update the GENERIC_ARCH_TOPOLOGY
Kconfig help section to reflect the same.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>

drivers/base/Kconfig

@@ -202,7 +202,7 @@ config GENERIC_ARCH_TOPOLOGY
 	help
 	  Enable support for architectures common topology code: e.g., parsing
 	  CPU capacity information from DT, usage of such information for
-	  appropriate scaling, sysfs interface for changing capacity values at
+	  appropriate scaling, sysfs interface for reading capacity values at
 	  runtime.
 
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