Update and rename aria-aria-button.md to aria-button.md

rename file name and update title in file

Author: Rabia2219

…ility-patterns-index/aria-aria-button.md …essibility-patterns-index/aria-button.mddocs/getting-started/accessibility-patterns-index/aria-aria-button.md renamed to docs/getting-started/accessibility-patterns-index/aria-button.md docs/getting-started/accessibility-patterns-index/aria-aria-button.md renamed to docs/getting-started/accessibility-patterns-index/aria-button.md

@@ -1,4 +1,4 @@
-# ARIA - ARIA button
+# ARIA button
 - WAVE Category: ARIA
 - WAVE ARIA: ARIA button