Doc typo fix. (#68172)

Doc typo fix. (#68172)

        * gtk/gtksocket.c (gtk_socket_get_id): Doc typo fix. (#68172)

        * gtk/gtktreemodel.c (gtk_tree_path_is_descendant): Fix docs.

        * gtk/gtktreemodel.c (gtk_tree_model_rows_reordered): Document.

        * gtk/gtkwindow.c (gtk_window_remove_accel_group): Fix docs.

        * gtk/gtkrc.c (gtk_rc_get_style_by_paths),
        gtk/gtkwidget.c (gtk_widget_get_toplevel,
        gtk_widget_push_composite_child), gtk/gtkdialog.c
        (gtk_dialog_new_with_buttons, gtk_dialog_run): Keep gtk-doc
        from messing up the indentation of inline examples.

        * gtk/gtkmain.c, gtk/gtkrc.c: Consistently call g_getenv()
        instead of getenv().

        * gtk/gtktreemodel.c, gtk/gtkaccelgroup.c, gtk/gtkclipboard.c,
        gtk/gtkdnd.c, gtk/gtkiconfactory.c, gtk/gtkrc.c,
        gtk/gtkstyle.c, gtk/gtkselection.c: Doc fixes.

        * gtk/gtkaccelmap.c (gtk_accel_map_add_filter,
        gtk_accel_map_foreach_unfiltered, gtk_accel_map_load_scanner):
        Document.

        * gtk/tmpl/gtksocket.sgml: Mention gtk_socket_get_id()
        instead of GTK_WINDOW_XWINDOW().  (#68172)

        * gtk/gtk-sections.txt: Move functions which are documented
        as "private" or "internal" into Private subsections.

        * gtk/tmpl/gtkdnd.sgml, gtk/tmpl/gtkobject.sgml,
        gtk/tmpl/gtkrc.sgml, gtk/tmpl/gtktooltips.sgml,
        gtk/tmpl/gtkwidget.sgml, gtk/tmpl/gtkclipboard.sgml,
        gtk/tmpl/gtkstyle.sgml, gtk/tmpl/gtkselection.sgml,
        gtk/tmpl/gtkfeatures.sgml: Minor markup fixes.

        * gtk/tmpl/gtksignal.sgml: Add link to GLib signal docs.

        * gtk/tmpl/gtkpreview.sgml, gtk/tmpl/gtktext.sgml,
        gtk/tmpl/gtktree.sgml: Remove "deprecated" from short desc.

        * gtk/tmpl/gtkrc.sgml: Correct names of default RC files.