Replace instance of versioned with stable (#283)

Author: Chris Cho

source/fundamentals/stable-api.txt

@@ -51,8 +51,8 @@ version of the {+stable-api+}.
 
 .. tip::
 
-   If you need to run commands using more than one version of the Versioned
-   API, instantiate a separate client with that version.
+   If you need to run commands using more than one version of the
+   {+stable-api+}, instantiate a separate client with that version.
 
    If you need to run commands not covered by the {+stable-api+}, make sure the
    "strict" option is disabled. See the section on