feature #13790 add _failure_path option to reference (zairigimad)

This PR was submitted for the 5.0 branch but it was merged into the 4.4 branch instead.

Discussion
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add _failure_path option to reference

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Commits
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950f255 add _failure_path option to reference

Author: wouterj

reference/configuration/security.rst

@@ -528,6 +528,14 @@ target_path_parameter
 When using a login form, if you include an HTML element to set the target path,
 this option lets you change the name of the HTML element itself.
 
+failure_path_parameter
+......................
+
+**type**: ``string`` **default**: ``_failure_path``
+
+When using a login form, if you include an HTML element to set the failure path,
+this option lets you change the name of the HTML element itself.
+
 use_referer
 ...........