guides: devstack-with-nested-kvm: Fix typo - s/AMD/Intel

In section "Configure Nested KVM for Intel-based Machines", this
sentence:

  Procedure to enable nested KVM virtualization on AMD-based machines.

should (obviously) read as:

  Procedure to enable nested KVM virtualization on Intel-based machines.

Change-Id: I9872a5d20a23f1cce7bf2a79bf29e1b11511b418
diff --git a/doc/source/guides/devstack-with-nested-kvm.rst b/doc/source/guides/devstack-with-nested-kvm.rst
index 2538c8d..58ec3d3 100644
--- a/doc/source/guides/devstack-with-nested-kvm.rst
+++ b/doc/source/guides/devstack-with-nested-kvm.rst
@@ -19,7 +19,7 @@
 Configure Nested KVM for Intel-based Machines
 ---------------------------------------------
 
-Procedure to enable nested KVM virtualization on AMD-based machines.
+Procedure to enable nested KVM virtualization on Intel-based machines.
 
 Check if the nested KVM Kernel parameter is enabled: