Update Changelog.rst

Co-authored-by: David Hassell <[email protected]>

Author: mattjbr123

Changelog.rst

@@ -7,7 +7,7 @@ version NEXTRELEASE
 * Fix bug where `cf.example_fields` returned a `list`
   of Fields rather than a `Fieldlist`
   (https://github.com/NCAS-CMS/cf-python/issues/725)
-* Fix bug where `cf.functions.normalize_slice` doesn't correctly
+* Fix bug where `cf.normalize_slice` doesn't correctly
   handle certain cyclic slices
   (https://github.com/NCAS-CMS/cf-python/issues/774)