Show default CMAKE_TOOLCHAIN_FILE is empty

Author: polytypic

commands/setup

@@ -16,7 +16,7 @@ Options:
   CTEST_OUTPUT_ON_FAILURE=1|0
   CTEST_VERBOSITY=|quiet|verbose
 
-  CMAKE_TOOLCHAIN_FILE=...
+  CMAKE_TOOLCHAIN_FILE=|...
 
   CC=cc|gcc|clang|...
   CXX=c++|g++|clang++|...