fix wording

src/dirtree.c

@@ -1,20 +1,21 @@
 /*
- * In memory, create tree of paths, where each node is path element. The tree
- * starts with root '/', the leaves are files. The three can look e.g. like
- * this:
+ * In memory, create tree from a set of file paths, where each node is path
+ * element.
+ * The tree starts with root '/', the leaves are files. The tree can look
+ * e.g. like this:
  *
  *                       "/"
  *		       /  |   \
  *		      /   |     \
  *		  "foo/" "f.txt"  "bar/"
- *		  /   \
- *		"a.c" "b.c"
+ *		  /   \             |
+ *		"a.c" "b.c"       "c.c"
  *
  * Populate the tree with given paths and print the leaves (no particular
  * order). Then free the allocated memory.
  *
  * You can also print non-leaf nodes as well and use indenting based on the
- * three level.
+ * tree level.
  */
 
 #include <stdio.h>