applied fixes from https://github.com/angular/angular.js/pull/12524/files#diff-348c2f3781ed66a24894c2046a52c628

Author: maistro-dave-amphlett

docs/content/error/$sanitize/badparse.ngdoc

@@ -0,0 +1,10 @@
+@ngdoc error
+@name $sanitize:noinert
+@fullName Can't create an inert html document
+@description
+
+This error occurs when `$sanitize` sanitizer determines that `document.implementation.createHTMLDocument ` api is not supported by the current browser.
+
+This api is necessary for safe parsing of HTML strings into DOM trees and without it the sanitizer can't sanitize the input.
+
+The api is present in all supported browsers including IE 9.0, so the presence of this error usually indicates that Angular's `$sanitize` is being used on an unsupported platform.

docs/content/error/$sanitize/noinert.ngdoc

@@ -0,0 +1,13 @@
+@ngdoc error
+@name $sanitize:uinput
+@fullName Failed to sanitize html because the input is unstable
+@description
+
+This error occurs when `$sanitize` sanitizer tries to check the input for possible mXSS payload and the verification
+errors due to the input mutating indefinitely. This could be a sign that the payload contains code exploiting an mXSS
+vulnerability in the browser.
+
+mXSS attack exploit browser bugs that cause some browsers parse a certain html strings into DOM, which once serialized
+doesn't match the original input. These browser bugs can be exploited by attackers to create payload which looks
+harmless to sanitizers, but due to mutations caused by the browser are turned into dangerous code once processed after
+sanitization.