docs: add attribute binding reference in accessibility guide

Author: SkyZeroZx

adev/src/content/best-practices/a11y.md

@@ -10,10 +10,8 @@ This page discusses best practices for designing Angular applications that work
 
 ## Accessibility attributes
 
-<!-- TODO: add link once attribute binding guide is implemented -->
-
 Building accessible web experiences often involves setting [Accessible Rich Internet Applications \(ARIA\) attributes](https://web.dev/learn/accessibility/aria-html/) to provide semantic meaning where it might otherwise be missing.
-Use attribute binding template syntax to control the values of accessibility-related attributes.
+Use [attribute binding](guide/templates/binding#binding-dynamic-properties-and-attributes) template syntax to control the values of accessibility-related attributes.
 
 ### ARIA attributes and properties