Example 1 - "A form that uses colour and an asterisk…": Research has shown that screen readers differ in their approach to asterisks - some do not read them out at all.
Remove this example, and provide additional examples, such as using the word "required" instead of an asterisk (I am happy to write these)
The Working Group tested three screen readers for support of the asterisk character. Two of three spoke the asterisk character using the default settings. In one screen reader the default settings had to be modified in order for the asterisk character to be spoken. The group feels that this level of support for the asterisk character is sufficient to include the example. However, we understand that screen readers in languages other than English my have difficulty speaking single characters so we have also included the example from How to Meet 1.3.2 , A form that uses color and text to indicate required fields, in the How to Meet document for 1.3.1.