Fix instructions on how to rebuild some modules
diff --git a/Lib/symbol.py b/Lib/symbol.py
index e3fff34..679e5c8 100755
--- a/Lib/symbol.py
+++ b/Lib/symbol.py
@@ -7,7 +7,7 @@
 #  To update the symbols in this file, 'cd' to the top directory of
 #  the python source tree after building the interpreter and run:
 #
-#    python Lib/symbol.py
+#    ./python Lib/symbol.py
 
 #--start constants--
 single_input = 256