Cleanup: ensure space after file named in headers

Add blank lines after file references to avoid them being interpreted as
doc-strings the following declarations.

source/blender/editors/include/UI_interface.h

@@ -598,6 +598,7 @@ typedef bool (*uiMenuStepFunc)(struct bContext *C, int direction, void *arg1);
 typedef void (*uiFreeArgFunc)(void *arg);
 
 /* interface_query.c */
+
 bool UI_but_has_tooltip_label(const uiBut *but);
 bool UI_but_is_tool(const uiBut *but);
 /* file selectors are exempt from utf-8 checks */
@@ -611,6 +612,7 @@ bool UI_block_can_add_separator(const uiBlock *block);
 struct uiList *UI_list_find_mouse_over(const struct ARegion *region, const struct wmEvent *event);
 
 /* interface_region_menu_popup.c */
+
 /**
  * Popup Menus
  *
@@ -676,6 +678,7 @@ struct uiLayout *UI_popover_layout(uiPopover *pup);
 void UI_popover_once_clear(uiPopover *pup);
 
 /* interface_region_menu_pie.c */
+
 /* Pie menus */
 typedef struct uiPieMenu uiPieMenu;