Doc: Fix commands not being shown in code blocks
Some commands are not shown in code blocks in the Advances Features
tutorial, they are shown as variable width text because of a missing ":"
to designate them as code blocks.
@@ -730,7 +730,7 @@ which ought to show roughly the following, with extraneous details removed::
The other way is to inject a packet to take advantage of the learning entry.
For example, we can inject a packet on p2 whose destination is the MAC address
-that we just learned on p1:
+that we just learned on p1::
$ ovs-appctl ofproto/trace br0 \
in_port=2,dl_src=90:00:00:00:00:01,dl_dst=f0:00:00:00:00:01 -generate
@@ -767,7 +767,7 @@ the learned port ``p1`` into register ``0``::
If you read the commands above carefully, then you might have noticed that they
simply have the Ethernet source and destination addresses exchanged. That
-means that if we now rerun the first ``ovs-appctl`` command above, e.g.:
+means that if we now rerun the first ``ovs-appctl`` command above, e.g.::
$ ovs-appctl ofproto/trace br0 \
in_port=1,dl_vlan=20,dl_src=f0:00:00:00:00:01,dl_dst=90:00:00:00:00:01 \
@@ -930,7 +930,7 @@ Now, if we rerun our first command::
-generate
...we can see that the result is no longer a flood but to the specified learned
-destination port ``p4``:
+destination port ``p4``::
Datapath actions: pop_vlan,4
