Documentation: kvm: extend KVM_S390_ZPCI_OP subheading underline

Stephen Rothwell reported the htmldocs warning:

Documentation/virt/kvm/api.rst:5959: WARNING: Title underline too short.

4.137 KVM_S390_ZPCI_OP
--------------------

The warning is due to subheading underline on KVM_S390_ZPCI_OP section is
short of 2 dashes.

Extend the underline to fix the warning.

Link: https://lore.kernel.org/linux-next/[email protected]/
Fixes: a0c4d1109d6cc5 ("KVM: s390: add KVM_S390_ZPCI_OP to manage guest zPCI devices")
Reported-by: Stephen Rothwell <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Pierre Morel <[email protected]>
Cc: Thomas Huth <[email protected]>
Cc: Matthew Rosato <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: Janosch Frank <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Bagas Sanjaya <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Christian Borntraeger <[email protected]>

0 files changed, 0 insertions, 0 deletions