docs: kvm: x86: Fix broken field list

Add a missing ":" to fix a broken field list.

Signed-off-by: Takahiro Itazuri <[email protected]>
Fixes: ba7bb66 ("KVM: x86: Provide per VM capability for disabling PMU virtualization")
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

Author: zulinx86

Documentation/virt/kvm/api.rst

@@ -8296,11 +8296,11 @@ ENOSYS for the others.
 8.35 KVM_CAP_PMU_CAPABILITY
 ---------------------------
 
-:Capability KVM_CAP_PMU_CAPABILITY
+:Capability: KVM_CAP_PMU_CAPABILITY
 :Architectures: x86
 :Type: vm
 :Parameters: arg[0] is bitmask of PMU virtualization capabilities.
-:Returns 0 on success, -EINVAL when arg[0] contains invalid bits
+:Returns: 0 on success, -EINVAL when arg[0] contains invalid bits
 
 This capability alters PMU virtualization in KVM.