Fix typo == --> --

docs/collection_of_examples/configuration.rst

@@ -244,15 +244,15 @@ Authenticate against different clouds
     . ...
     . <response from deploymentexample.com>
     . ...
-    $ kamaki ==cloud=mytest user authenticate
+    $ kamaki --cloud=mytest user authenticate
     . ...
     . <response from example.com>
     . ...
-    $ kamaki ==cloud=default user authenticate
+    $ kamaki --cloud=default user authenticate
     . ...
     . <response from deploymentexample.com, same as default behavior>
     . ...
-    $ kamaki ==cloud=nonexistingcloud user authenticate
+    $ kamaki --cloud=nonexistingcloud user authenticate
     . No cloud "nonexistingcloud" is configured
     . |  To configure a new cloud "nonexistingcloud", find and set the
     . |  single authentication URL and token: