PEP 750: Fix code example and CPython version in abstract (#3902)

peps/pep-0750.rst

@@ -34,10 +34,10 @@ Tag functions accept prepared arguments and return a string:
     def greet(*args):
         """Tag function to return a greeting with an upper-case recipient."""
         salutation, recipient, *_ = args
-        _, getvalue = recipient
+        getvalue, *_ = recipient
         return f"{salutation.title().strip()} {getvalue().upper()}!"
 
-Below you can find richer examples. As a note, an implementation based on CPython 3.12
+Below you can find richer examples. As a note, an implementation based on CPython 3.14
 exists, as discussed in this document.
 
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