Removes an unexpected character in the README file, which was causing issues when running autorest command. (#16911)

Co-authored-by: Lucas Santos <[email protected]>

Author: lucasrsant

specification/communication/data-plane/PhoneNumbers/readme.md

@@ -48,7 +48,7 @@ directive:
     suppress:
     - R2005 #Long running operation status code
     reason:
-    - Approval from Azure review board that Long Running Operations can return 202s.
+      Approval from Azure review board that Long Running Operations can return 202s.
 ```
 
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