docs: update link for WebAims Screen Reader User Survey (#4621)

Updates the link to WebAims Screen Reader User Survey to point to the
current survey.

Author: anticultist

doc/accessibility-supported.md

@@ -6,7 +6,7 @@ In order to adhere to the manifesto and at the same time be useful to developers
 
 Accessibility supported means that in order for a technique to pass, it must work in some predefined set of browsers and assistive technologies. For axe-core this means that for a screen reader, browser, or environment to be added to the list of supported combinations, the following two criteria must be met:
 
-1. Be used by more than 1% of users (currently extrapolated from the [WebAims Screen Reader User Survey](https://webaim.org/projects/screenreadersurvey8/#browsercombos))
+1. Be used by more than 1% of users (currently extrapolated from the [WebAims Screen Reader User Survey](https://webaim.org/projects/screenreadersurvey10/#browsercombos))
 1. Introduce new coverage for a screen reader, browser, or environment not currently accessibility supported
 
 We currently test the following AT combinations for support