Alphabetized imports in various docs.

Follow-up of d97cce3409 and 7d3fe36c62.

docs/howto/outputting-csv.txt

@@ -105,7 +105,7 @@ template output the commas in a :ttag:`for` loop.
 Here's an example, which generates the same CSV file as above::
 
     from django.http import HttpResponse
-    from django.template import loader, Context
+    from django.template import Content, loader
 
     def some_view(request):
         # Create the HttpResponse object with the appropriate CSV header.

docs/howto/outputting-pdf.txt

@@ -46,8 +46,8 @@ objects are file-like objects.
 
 Here's a "Hello World" example::
 
-    from reportlab.pdfgen import canvas
     from django.http import HttpResponse
+    from reportlab.pdfgen import canvas
 
     def some_view(request):
         # Create the HttpResponse object with the appropriate PDF headers.