Fixed poncho doc package create and run issue (#3951)

Both specs and output are required in poncho_package_create

doc/manuals/poncho/index.md

@@ -63,14 +63,14 @@ This will create `package.json` with contents similar to this:
 Then to create a complete package from the specification:
 
 ```
-poncho_package_create package.json
+poncho_package_create package.json package.tar.gz
 ```
 
 Once created, this package can be moved to another machine for execution.
 Then, to run a program in the environment:
 
 ```
-poncho_package_run -e package.tar.gz -- example.py
+poncho_package_run -e package.tar.gz -- python example.py
 ```
 
 ## Specification File