minor #10166 Removing outdated note: AJAX requests are not set to target path (weaverryan)

This PR was merged into the 2.8 branch.

Discussion
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Removing outdated note: AJAX requests are not set to target path

Hey guys!

As far as I can tell, AJAX requests have not been added to the target path session key since at least 2.7. So, I think we can safely remove this stuff.

Cheers!

Commits
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f47212b Removing outdated note: AJAX requests are not set to target path

Author: javiereguiluz

security.rst

@@ -1281,7 +1281,6 @@ Authentication (Identifying/Logging in the User)
     security/api_key_authentication
     security/custom_authentication_provider
     security/pre_authenticated
-    security/target_path
     security/csrf_in_login_form
     security/named_encoders
     security/multiple_user_providers

security/form_login.rst

@@ -24,13 +24,6 @@ in the session (perhaps the user went directly to the login page), then the user
 is redirected to ``/`` (i.e. the homepage). You can change this behavior in
 several ways.
 
-.. note::
-
-    Sometimes, redirecting to the originally requested page can cause problems,
-    like if a background Ajax request "appears" to be the last visited URL,
-    causing the user to be redirected there. For information on controlling this
-    behavior, see :doc:`/security/target_path`.
-
 Changing the default Page
 ~~~~~~~~~~~~~~~~~~~~~~~~~