gh-106318: Make example for str.isascii() shorter

Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>

Author: adorilson

Doc/library/stdtypes.rst

@@ -2000,16 +2000,10 @@ expression support in the :mod:`re` module).
 
    For example::
 
-      >>> 'a commom word'.isascii()
-      True
-      >>> 'acommomword'.isascii()
+      >>> 'a common word'.isascii()
       True
       >>> 'µ'.isascii()
       False
-      >>> 'æ'.isascii()
-      False
-      >>> 'Ŧ'.isascii()
-      False
 
    .. versionadded:: 3.7