Improve port binding docs

- Reword a sentence that was wrong ("container" and "host" were the
  wrong way round)

- Put the multiple-ports example before the multiple-IPs example

Signed-off-by: Aanand Prasad <[email protected]>

Author: aanand

docs/port-bindings.md

@@ -38,19 +38,21 @@ container_id = cli.create_container(
 )
 ```
 
-If trying to bind several IPs to the same port, you may use the following syntax:
+To bind multiple host ports to a single container port, use the following syntax:
+
 ```python
 cli.create_host_config(port_bindings={
-    1111: [
-        ('192.168.0.100', 1234),
-        ('192.168.0.101', 1234)
-    ]
+    1111: [1234, 4567]
 })
 ```
 
-Similarly for several container ports bound to a single host port:
+You can also bind multiple IPs to a single container port:
+
 ```python
 cli.create_host_config(port_bindings={
-    1111: [1234, 4567]
+    1111: [
+        ('192.168.0.100', 1234),
+        ('192.168.0.101', 1234)
+    ]
 })
 ```