ACTION-1011: new example for 2.11.3 based on SB04

Per ACTION-1011, here is an additional example for 2.11.3 (Execution Toggle), adapted from the scenario that Silan Brown reported. The given name can be considered a placeholder.

"Pavel has low vision, so his browser is set to show extremely large text. He needs to click on a control on a web page, but when he moves the pointer over it a script inserts explanatory text onto the page. Because of the large font size this shifts the control out from under the pointer, causing the new text to disappear. This moves the control back under the mouse, and the cycle repeats itself. The page continues to flicker back and forth, and he is unable to click on the control. To work around this problem he uses a browser command to temporarily disable scripts on the page, allowing him to click on the control and complete his task."

     Greg