KVM: x86: Delete documentation for READ|WRITE in KVM_X86_SET_MSR_FILTER

Delete the paragraph that describes the behavior when both
KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE are set for a range.  There is
nothing special about KVM's handling of this combination, whereas
explicitly documenting the combination suggests that there is some magic
behavior the user needs to be aware of.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220831001706.4075399-2-seanjc@google.com

Documentation/virt/kvm/api.rst

@@ -4115,13 +4115,6 @@ flags values for ``struct kvm_msr_filter_range``:
   a write for a particular MSR should be handled regardless of the default
   filter action.
 
-``KVM_MSR_FILTER_READ | KVM_MSR_FILTER_WRITE``
-
-  Filter both read and write accesses to MSRs using the given bitmap. A 0
-  in the bitmap indicates that both reads and writes should immediately fail,
-  while a 1 indicates that reads and writes for a particular MSR are not
-  filtered by this range.
-
 flags values for ``struct kvm_msr_filter``:
 
 ``KVM_MSR_FILTER_DEFAULT_ALLOW``