qmp-commands: move 'inject-nmi' doc to schema

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

docs/qmp-commands.txt

@@ -195,20 +195,6 @@ Example:
 
 Note: CPUs' indexes are obtained with the 'query-cpus' command.
 
-inject-nmi
-----------
-
-Inject an NMI on the default CPU (x86/s390) or all CPUs (ppc64).
-
-Arguments: None.
-
-Example:
-
--> { "execute": "inject-nmi" }
-<- { "return": {} }
-
-Note: inject-nmi fails when the guest doesn't support injecting.
-
 xen-save-devices-state
 -------
 

qapi-schema.json

@@ -2319,12 +2319,19 @@
 # @inject-nmi:
 #
 # Injects a Non-Maskable Interrupt into the default CPU (x86/s390) or all CPUs (ppc64).
+# The command fails when the guest doesn't support injecting.
 #
 # Returns:  If successful, nothing
 #
 # Since:  0.14.0
 #
 # Note: prior to 2.1, this command was only supported for x86 and s390 VMs
+#
+# Example:
+#
+# -> { "execute": "inject-nmi" }
+# <- { "return": {} }
+#
 ##
 { 'command': 'inject-nmi' }