Help: Verification target also sets CXX_SCAN_FOR_MODULES to false

4fd596c34c (cmGeneratorTarget: disable C++ module scanning for
verify targets, 2023-12-11) added the CXX_SCAN_FOR_MODULES
property to the list of properties set to false in the verification target
when VERIFY_INTERFACE_HEADER_SETS is true, but it didn't update
the documentation of that target property. This adds the missing
doc update.

Help/prop_tgt/VERIFY_INTERFACE_HEADER_SETS.rst

@@ -17,7 +17,8 @@ The verification target links against the original target to get all of its
 usage requirements. The verification target has its
 :prop_tgt:`EXCLUDE_FROM_ALL` and :prop_tgt:`DISABLE_PRECOMPILE_HEADERS`
 properties set to true, and its :prop_tgt:`AUTOMOC`, :prop_tgt:`AUTORCC`,
-:prop_tgt:`AUTOUIC`, and :prop_tgt:`UNITY_BUILD` properties set to false.
+:prop_tgt:`AUTOUIC`, :prop_tgt:`UNITY_BUILD`, and
+:prop_tgt:`CXX_SCAN_FOR_MODULES` properties set to false.
 
 If the header's :prop_sf:`LANGUAGE` property is set, the value of that property
 is used to determine the language with which to compile the header file.