KVM: Documentation: Fix title underline too short warning

Fix "WARNING: Title underline too short" by extending title line to the
proper length.

Signed-off-by: Chang Yu <marcus.yu.56@gmail.com>
Message-ID: <ZqB3lofbzMQh5Q-5@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>