fix typo and improve clarity on installing packages via "requirements.txt"#1215

Merged

laurenyu merged 2 commits intoaws:masterfrom

billdoors:master

Jan 8, 2020

Commits on Jan 8, 2020

fix typo
Qingwei Li
committed
Without specifying "source_dir" and put ``requirements.txt`` in that folder, packages in "requirements.txt" will fail to install.
Qingwei Li
committed