Help: Reference IMPORTED_IMPLIB from the IMPORTED_LOCATION documentation

Issue: #16698

Help/prop_tgt/IMPORTED_LOCATION.rst

@@ -26,3 +26,6 @@ selected and its :prop_tgt:`IMPORTED_LOCATION_<CONFIG>` value used.
 
 To get the location of an imported target read one of the :prop_tgt:`LOCATION`
 or ``LOCATION_<CONFIG>`` properties.
+
+For platforms with import libraries (e.g. Windows) see also
+:prop_tgt:`IMPORTED_IMPLIB`.