KVM: Reformat KVM_SET_ONE_REG register documentation

Some of the MIPS registers that can be accessed with the
KVM_{GET,SET}_ONE_REG interface have fairly long names, so widen the
Register column of the table in the KVM_SET_ONE_REG documentation to
allow them to fit.

Tabs in the table are replaced with spaces at the same time for
consistency.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Gleb Natapov <gleb@kernel.org>
Cc: kvm@vger.kernel.org
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Documentation/virtual/kvm/api.txt

@@ -1871,7 +1871,7 @@ registers, find a list below:
   PPC   | KVM_REG_PPC_VRSAVE            | 32
   PPC   | KVM_REG_PPC_LPCR              | 64
   PPC   | KVM_REG_PPC_PPR               | 64
-  PPC   | KVM_REG_PPC_ARCH_COMPAT 32
+  PPC   | KVM_REG_PPC_ARCH_COMPAT       | 32
   PPC   | KVM_REG_PPC_DABRX             | 32
   PPC   | KVM_REG_PPC_WORT              | 64
   PPC   | KVM_REG_PPC_TM_GPR0           | 64