[3.13] Docs: Emphasize parameter name in pkgutil.iter_importers (pythonGH-135597) (pythonGH-135711)

Docs: Emphasize parameter name in `pkgutil.iter_importers` (pythonGH-135597)
(cherry picked from commit ff639af)

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

Author: miss-islington

Doc/library/pkgutil.rst

@@ -109,8 +109,8 @@ support.
 
    Yield :term:`finder` objects for the given module name.
 
-   If fullname contains a ``'.'``, the finders will be for the package
-   containing fullname, otherwise they will be all registered top level
+   If *fullname* contains a ``'.'``, the finders will be for the package
+   containing *fullname*, otherwise they will be all registered top level
    finders (i.e. those on both :data:`sys.meta_path` and :data:`sys.path_hooks`).
 
    If the named module is in a package, that package is imported as a side