Fixed #30573 -- Rephrased documentation to avoid words that minimise the involved difficulty.

This patch does not remove all occurrences of the words in question.
Rather, I went through all of the occurrences of the words listed
below, and judged if they a) suggested the reader had some kind of
knowledge/experience, and b) if they added anything of value (including
tone of voice, etc). I left most of the words alone. I looked at the
following words:

- simply/simple
- easy/easier/easiest
- obvious
- just
- merely
- straightforward
- ridiculous

Thanks to Carlton Gibson for guidance on how to approach this issue, and
to Tim Bell for providing the idea. But the enormous lion's share of
thanks go to Adam Johnson for his patient and helpful review.

docs/ref/clickjacking.txt

@@ -37,10 +37,9 @@ loading in a frame no matter which site made the request.
 
 .. _X-Frame-Options: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Frame-Options
 
-Django provides a few simple ways to include this header in responses from your
-site:
+Django provides a few ways to include this header in responses from your site:
 
-#. A simple middleware that sets the header in all responses.
+#. A middleware that sets the header in all responses.
 
 #. A set of view decorators that can be used to override the middleware or to
    only set the header for certain views.