Minor documentation improvements

find-dups

@@ -50,12 +50,12 @@ Options:
 
   --ignore-dir NAME
     Don't descend into any directories named NAME.
-    (use multiple times, once for each NAME)
+    (Can use multiple times, once for each NAME.)
 
   --ignore-contained DIRPATH
     Ignore duplicates if they're all contained, directly or indirectly 
     via path ancestry, under the directory DIRPATH.
-    (use multiple times, once for each NAME)
+    (Can use multiple times, once for each DIRPATH.)
 
   --inverse
     Show only files that are unique, i.e., that have no duplicates.