Update/correct 3.3.1 understanding

* change reference to "WCAG 2.0" to just "WCAG"
* remove the now outdated "Currently, few technologies support this kind of programmatic information", as that's not true anymore
* clarify that programmatic information is not covered by this SC, but that others like 4.1.2 apply
* corrects link to error suggestion from "3.3.1" to "3.3.3"

Closes #1797

Author: patrickhlauke

understanding/20/error-identification.html

@@ -16,12 +16,12 @@ <h2>Intent of Error Identification</h2>
       <p>The intent of this Success Criterion is to ensure that users are aware that an error
          has occurred and can determine what is wrong. The error message should be as specific
          as possible. 
-         						In the case of an unsuccessful form submission, re-displaying the form and indicating
+         In the case of an unsuccessful form submission, re-displaying the form and indicating
          the fields in error is insufficient for some users to perceive that an error has occurred.
          Screen reader users, for example, will not know there was an error until they encounter
          one of the indicators. They may abandon the form altogether before encountering the
-         error indicator, thinking that the page simply is not functional. Per the definition in WCAG 2.0, an "input error" is information provided by the user
-         that is not accepted. This includes: 
+         error indicator, thinking that the page simply is not functional. Per the definition in
+         WCAG, an "input error" is information provided by the user that is not accepted. This includes: 
       </p>
 
       <ul>
@@ -72,19 +72,15 @@ <h2>Intent of Error Identification</h2>
          that user agents or assistive technologies can use to identify an error and provide
          error information to the user. For example, certain technologies can specify that
          the user's input must not fall outside a specific range, or that a form field is required.
-         Currently, few technologies support this kind of programmatic information, but the
-         Success Criterion does not require, nor prevent it.
-         
+         This type of programmatic information is not required for this success criterion, but is covered
+         by other criteria such as <a href="#name-role-value">4.1.2 Name, Role, Value</a>.
       </p>
 
       <p>It is perfectly acceptable to indicate the error in other ways such as image, color
          etc, in addition to the text description. 
-         
       </p>
 
-      <p>See also 
-         <a href="error-suggestion">3.3.1: Error Suggestion</a>.
-      </p>
+      <p>See also <a href="error-suggestion">3.3.3: Error Suggestion</a>.</p>
 
 
    </section>