fixed namespaces info

doc/api/groups.md

@@ -181,12 +181,12 @@ Parameters:
 By default, groups only get 20 namespaces at a time because the API results are paginated.
-To get more (up to 100), pass the following as an argument to the API call
+To get more (up to 100), pass the following as an argument to the API call:
 ```
 per_page=100
 ```
-And to switch pages add 
+And to switch pages add: 
 ```
 page=2
-```
+```
\ No newline at end of file