Help/prop_dir/EXCLUDE_FROM_ALL: Minor wording fix

Help/prop_dir/EXCLUDE_FROM_ALL.rst

@@ -3,7 +3,7 @@ EXCLUDE_FROM_ALL
 
 Set this directory property to a true value on a subdirectory to exclude
 its targets from the "all" target of its ancestors.  If excluded, running
-e.g. ``make`` in the parent directory will not build targets the
+e.g. ``make`` in the parent directory will not build targets in the
 subdirectory by default.  This does not affect the "all" target of the
 subdirectory itself.  Running e.g. ``make`` inside the subdirectory will
 still build its targets.