KVM: Fix VM exit code for full dirty ring in API documentation

While reading the documentation, I saw a exit code I could not grep for, to
figure out it has a slightly different name.

Fix that name in documentation so it points to the right exit code.

Signed-off-by: Leonardo Bras <leo.bras@arm.com>
Link: https://lore.kernel.org/r/20251014152802.13563-1-leo.bras@arm.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

Author: Leonardo Bras

Documentation/virt/kvm/api.rst

@@ -8510,7 +8510,7 @@ Therefore, the ioctl must be called *before* reading the content of
 the dirty pages.
 
 The dirty ring can get full.  When it happens, the KVM_RUN of the
-vcpu will return with exit reason KVM_EXIT_DIRTY_LOG_FULL.
+vcpu will return with exit reason KVM_EXIT_DIRTY_RING_FULL.
 
 The dirty ring interface has a major difference comparing to the
 KVM_GET_DIRTY_LOG interface in that, when reading the dirty ring from