Doc: Replace question mark with fullstop (pythonGH-99558)

The sentence "Set the LC_CTYPE locale to the user preferred locale." should end with a period
instead of a question mark.
(cherry picked from commit 0e09d2c)

Co-authored-by: Rafael Fontenelle <rffontenelle@users.noreply.github.com>

Author: miss-islington

Doc/c-api/init_config.rst

@@ -254,7 +254,7 @@ PyPreConfig
 
    .. c:member:: int configure_locale
 
-      Set the LC_CTYPE locale to the user preferred locale?
+      Set the LC_CTYPE locale to the user preferred locale.
 
       If equals to 0, set :c:member:`~PyPreConfig.coerce_c_locale` and
       :c:member:`~PyPreConfig.coerce_c_locale_warn` members to 0.