Zap the reference to the --project parameter
Zap the reference to the --project parameter

Summary: Not in the source; not in `buck help clean`

Test Plan:
```
docs/soyweb-prod.sh
docs/soy2html.sh  /tmp/buckdox
```
Open `http://127.0.0.1:9814/command/clean.html` in browser.

Reviewed By: asp2insp

fbshipit-source-id: dfec4a5

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