Replace ${pwd} with ${PWD} in run command

[devskillz47]

Content Bug Report

Page(s) Affected

https://www.tremor.rs/docs/0.12/guides/basics/#running

What needs to be fixed?

The ${pwd} element from the following run command evaluates to empty- at least in WSL for windows
$ TREMOR_PATH="$TREMOR_PATH:${pwd}/transform" tremor run transfor/main.troy

Suggested Improvement

Replace ${pwd} with ${PWD} in the run command which will evaluate to the current working directory path