Negligible spacing changes to docs/csrf.txt to be consistent

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4224 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/csrf.txt

 =====================================
-Cross Site Request Forgery Protection
+Cross Site Request Forgery protection
 =====================================
 
-The CsrfMiddleware class provides easy-to-use protection against 
-`Cross Site Request Forgeries`_.  This type of attack occurs when a malicious 
+The CsrfMiddleware class provides easy-to-use protection against
+`Cross Site Request Forgeries`_.  This type of attack occurs when a malicious
 web site creates a link or form button that is intended to perform some action
 on your web site, using the credentials of a logged-in user who is tricked
 into clicking on the link in their browser.
@@ -12,12 +12,12 @@ The first defense against CSRF attacks is to ensure that GET requests
 are side-effect free.  POST requests can then be protected by adding this
 middleware into your list of installed middleware.
 
-
 .. _Cross Site Request Forgeries:  http://www.squarefree.com/securitytips/web-developers.html#CSRF
 
 How to use it
 =============
-Add the middleware ``'django.contrib.csrf.middleware.CsrfMiddleware'`` to 
+
+Add the middleware ``'django.contrib.csrf.middleware.CsrfMiddleware'`` to
 your list of middleware classes, ``MIDDLEWARE_CLASSES``. It needs to process
 the response after the SessionMiddleware, so must come before it in the
 list. It also must process the response before things like compression
@@ -25,16 +25,17 @@ happen to the response, so it must come after GZipMiddleware in the list.
 
 How it works
 ============
+
 CsrfMiddleware does two things:
 
-1. It modifies outgoing requests by adding a hidden form field to all 
-   'POST' forms, with the name 'csrfmiddlewaretoken' and a value which is 
-   a hash of the session ID plus a secret. If there is no session ID set, 
-   this modification of the response isn't done, so there is very little 
+1. It modifies outgoing requests by adding a hidden form field to all
+   'POST' forms, with the name 'csrfmiddlewaretoken' and a value which is
+   a hash of the session ID plus a secret. If there is no session ID set,
+   this modification of the response isn't done, so there is very little
    performance penalty for those requests that don't have a session.
 
-2. On all incoming POST requests that have the session cookie set, it 
-   checks that the 'csrfmiddlewaretoken' is present and correct. If it 
+2. On all incoming POST requests that have the session cookie set, it
+   checks that the 'csrfmiddlewaretoken' is present and correct. If it
    isn't, the user will get a 403 error.
 
 This ensures that only forms that have originated from your web site
@@ -43,26 +44,26 @@ can be used to POST data back.
 It deliberately only targets HTTP POST requests (and the corresponding
 POST forms). GET requests ought never to have side effects (if you are
 using HTTP GET and POST correctly), and so a CSRF attack with a GET
-request will always be harmless. 
+request will always be harmless.
 
 POST requests that are not accompanied by a session cookie are not protected,
 but they do not need to be protected, since the 'attacking' web site
 could make these kind of requests anyway.
 
-The Content-Type is checked before modifying the response, and only 
+The Content-Type is checked before modifying the response, and only
 pages that are served as 'text/html' or 'application/xml+xhtml'
 are modified.
 
 Limitations
 ===========
+
 CsrfMiddleware requires Django's session framework to work. If you have
 a custom authentication system that manually sets cookies and the like,
 it won't help you.
 
-If your app creates HTML pages and forms in some unusual way, (e.g. 
-it sends fragments of HTML in javascript document.write statements) 
-you might bypass the filter that adds the hidden field to the form, 
+If your app creates HTML pages and forms in some unusual way, (e.g.
+it sends fragments of HTML in javascript document.write statements)
+you might bypass the filter that adds the hidden field to the form,
 in which case form submission will always fail.  It may still be possible
 to use the middleware, provided you can find some way to get the
-CSRF token and ensure that is included when your form is submitted.
-
+CSRF token and ensure that is included when your form is submitted.
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