KVM: fix Kconfig menu text for -Werror

This was evidently copy and pasted from the i915 driver, but the text
wasn't updated.

Fixes: 4f337faf ("KVM: allow disabling -Werror")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/Kconfig

@@ -68,7 +68,7 @@ config KVM_WERROR
 	depends on (X86_64 && !KASAN) || !COMPILE_TEST
 	depends on EXPERT
 	help
-	  Add -Werror to the build flags for (and only for) i915.ko.
+	  Add -Werror to the build flags for KVM.
 
 	  If in doubt, say "N".