Update pep-0758.rst

Author: Wulian233

peps/pep-0758.rst

@@ -57,7 +57,7 @@ The same change would apply to ``except*`` expressions. For example:
     except* ExceptionA, ExceptionB, ExceptionC:
         ...
 
-When using the ``as`` clause to capture the exception instance paretheses must
+When using the ``as`` clause to capture the exception instance parentheses must
 be used as before. Some users have expressed that they would find it confusing not
 to require parentheses as it would be unclear what exactly is being assigned to
 the target since in other parts of the language multiple ``as`` clauses can be used