[docs] Standardize WAI-ARIA references

docs/data/data-grid/accessibility/accessibility.md

@@ -16,7 +16,7 @@ WCAG 2.1 has three levels of conformance: A, AA, and AAA.
 Level AA meets the most commonly encountered conformance guidelines.
 This is the most common target for organizations so what we aims to support very well.
 
-The [WAI-ARIA authoring practices](https://www.w3.org/WAI/ARIA/apg/patterns/grid/) provide valuable information on how to optimize the accessibility of a data grid.
+The [WAI-ARIA Authoring Practices](https://www.w3.org/WAI/ARIA/apg/patterns/grid/) provide valuable information on how to optimize the accessibility of a data grid.
 
 ## Density
 
@@ -47,7 +47,7 @@ The Data Grid listens for keyboard interactions from the user and emits events i
 
 ### Tab sequence
 
-According to [WAI-ARIA](https://www.w3.org/WAI/ARIA/apg/patterns/grid/), only one of the focusable elements contained by a composite widget should be included in the page tab sequence.
+According to [WAI-ARIA Authoring Practices](https://www.w3.org/WAI/ARIA/apg/patterns/grid/), only one of the focusable elements contained by a composite widget should be included in the page tab sequence.
 For an element to be included in the tab sequence, it needs to have a `tabIndex` value of zero or greater.
 
 When a user focuses on a Data Grid cell, the first inner element with `tabIndex={0}` receives the focus.

docs/data/data-grid/overview/overview.md

@@ -111,7 +111,7 @@ Here are some resources you might be interested in to learn more about the data
 
 - The [source on GitHub](https://github.com/mui/mui-x/tree/HEAD/packages/)
 - The [Material Design specification](https://m2.material.io/components/data-tables) specification
-- The accessibility [WAI-ARIA authoring practices](https://www.w3.org/WAI/ARIA/apg/patterns/grid/)
+- The accessibility [WAI-ARIA Authoring Practices](https://www.w3.org/WAI/ARIA/apg/patterns/grid/)
 - The Figma, Adobe XD, and Sketch [design kits](https://mui.com/design-kits/).
 
 ## API