fix incorrect pwd path

Author: klarkc

documentation.md

@@ -76,7 +76,7 @@ docker run \
 ```
 
 `--rm` removes the container after running, `-it` makes it interactive, `-v ~:/root` mounts your home directory to the
-home directory inside the container, `-v ~$(pwd):/pwd` mounts current directory inside the container to gtt be able to read local config. If you want to store the config in another place, mount another directory: 
+home directory inside the container, `-v $(pwd):/pwd` mounts current directory inside the container to gtt be able to read local config. If you want to store the config in another place, mount another directory: 
 
 
  ```shell