Autogen: Docs: Extend SKIP_AUTOUIC documentation

Help/prop_sf/SKIP_AUTOUIC.rst

@@ -3,6 +3,9 @@ SKIP_AUTOUIC
 
 Exclude the source file from :prop_tgt:`AUTOUIC` processing (for Qt projects).
 
+:prop_sf:`SKIP_AUTOUIC` can be set on C++ header and source files and on
+``.ui`` files.
+
 For broader exclusion control see :prop_sf:`SKIP_AUTOGEN`.
 
 EXAMPLE
@@ -12,4 +15,6 @@ EXAMPLE
 
   # ...
   set_property(SOURCE file.h PROPERTY SKIP_AUTOUIC ON)
+  set_property(SOURCE file.cpp PROPERTY SKIP_AUTOUIC ON)
+  set_property(SOURCE widget.ui PROPERTY SKIP_AUTOUIC ON)
   # ...