Change word in @internationalized/number readme (#6321)

Great set of tools. Thank you

Arab: person, ethno-linguistic category
Arabic: language

Co-authored-by: omar <omaraziz.dev@proton.me>

packages/@internationalized/number/README.md

@@ -36,7 +36,7 @@ parser.isValidPartialNumber('10 x'); // -> false
 import {NumberParser} from '@internationalized/number';
 
 let parser = new NumberParser('en-US', {style: 'decimal'});
-parser.getNumberingSystem('١٢') // -> 'arab'
+parser.getNumberingSystem('١٢') // -> 'arabic'
 ```
 
 ## NumberFormatter