virtual: Documentation: simplify and generalize paravirt_ops.txt

The general documentation we have for pv_ops is currenty present
on the IA64 docs, but since this documentation covers IA64 xen
enablement and IA64 Xen support got ripped out a while ago
through commit d52eefb47 present since v3.14-rc1 lets just
simplify, generalize and move the pv_ops documentation to a
shared place.

Cc: Isaku Yamahata <yamahata@valinux.co.jp>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: virtualization@lists.linux-foundation.org
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: xen-devel@lists.xenproject.org
Cc: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/MAINTAINERS b/MAINTAINERS
index 93409ad..9af1c6e 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -7171,7 +7171,7 @@
 M:	Rusty Russell <rusty@rustcorp.com.au>
 L:	virtualization@lists.linux-foundation.org
 S:	Supported
-F:	Documentation/ia64/paravirt_ops.txt
+F:	Documentation/virtual/paravirt_ops.txt
 F:	arch/*/kernel/paravirt*
 F:	arch/*/include/asm/paravirt.h