Fixed --ip6 and --ip6_discovery_command document location.

Review: https://reviews.apache.org/r/65274
diff --git a/docs/configuration/agent.md b/docs/configuration/agent.md
index adf8161..bf2d7b9 100644
--- a/docs/configuration/agent.md
+++ b/docs/configuration/agent.md
@@ -915,6 +915,33 @@
 </tr>
 <tr>
   <td>
+    --ip6=VALUE
+  </td>
+  <td>
+IPv6 address to listen on. This cannot be used in conjunction
+with <code>--ip6_discovery_command</code>.
+<p/>
+NOTE: Currently Mesos doesn't listen on IPv6 sockets and hence
+this IPv6 address is only used to advertise IPv6 addresses for
+containers running on the host network.
+  </td>
+</tr>
+<tr>
+  <td>
+    --ip6_discovery_command=VALUE
+  </td>
+  <td>
+Optional IPv6 discovery binary: if set, it is expected to emit
+the IPv6 address on which Mesos will try to bind when IPv6 socket
+support is enabled in Mesos.
+<p/>
+NOTE: Currently Mesos doesn't listen on IPv6 sockets and hence
+this IPv6 address is only used to advertise IPv6 addresses for
+containers running on the host network.
+  </td>
+</tr>
+<tr>
+  <td>
     --isolation=VALUE
   </td>
   <td>
diff --git a/docs/configuration/master-and-agent.md b/docs/configuration/master-and-agent.md
index 53bcead..f247498 100644
--- a/docs/configuration/master-and-agent.md
+++ b/docs/configuration/master-and-agent.md
@@ -184,33 +184,6 @@
 </tr>
 <tr>
   <td>
-    --ip6=VALUE
-  </td>
-  <td>
-IPv6 address to listen on. This cannot be used in conjunction
-with <code>--ip6_discovery_command</code>.
-<p/>
-NOTE: Currently Mesos doesn't listen on IPv6 sockets and hence
-this IPv6 address is only used to advertise IPv6 addresses for
-containers running on the host network.
-  </td>
-</tr>
-<tr>
-  <td>
-    --ip6_discovery_command=VALUE
-  </td>
-  <td>
-Optional IPv6 discovery binary: if set, it is expected to emit
-the IPv6 address on which Mesos will try to bind when IPv6 socket
-support is enabled in Mesos.
-<p/>
-NOTE: Currently Mesos doesn't listen on IPv6 sockets and hence
-this IPv6 address is only used to advertise IPv6 addresses for
-containers running on the host network.
-  </td>
-</tr>
-<tr>
-  <td>
     --modules=VALUE
   </td>
   <td>