cleanup, docs

site/doc/pages/file_unlink.txt

@@ -2,13 +2,18 @@
 void file_unlink(String file_name)
 
 :params
-file_name : name of the file
+file_name : file to delete, resolved against the unit's directory
+return value : none
+
+:content
+Deletes a file. Deleting a path that does not exist is a no-op, so it is safe to call before recreating a file.
+
+:example
+file_put_contents("/tmp/doc-unlink.txt", "x");
+file_unlink("/tmp/doc-unlink.txt");
+print(file_exists("/tmp/doc-unlink.txt") ? "exists" : "gone", "\n");
 
 :see
 >sys
-
-:content
-Deletes the file identified by `file_name`.
-
-:example
-print("file_unlink example\n");
+file_exists
+dir_remove