Fix additional typos in docs (thanks tomthorogood)

docs/config.rst

@@ -365,7 +365,7 @@ values. The valid configuration keys are listed below.
 
     Then you don't need to specify a ``world`` key in the render dictionaries::
 
-        render['arender'] = {
+        renders['arender'] = {
                 'title': 'This render doesn't explicitly declare a world!',
                 }
 

docs/faq.rst

@@ -219,7 +219,7 @@ into your config.  In your config, do the following
     
     # all the usual config stuff goes here
     
-    render["myrender"] = {
+    renders["myrender"] = {
         "title" : "foo",
         "world" : "someworld",
         "manualpois" : mymarkers,                         # IMPORTANT! Variable name from manualmarkers.py