Tutorial: Creating an Horizon Plugin in horizon - horizon/tools/with_venv.sh not exist

[GaoFei]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [x] This doc is inaccurate in this way: horizon/tools/with_venv.sh not exist
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

If you have a troubleshooting or support issue, use the following resources:

 - Ask OpenStack: http://ask.openstack.org
 - The mailing list: http://lists.openstack.org
 - IRC: 'openstack' channel on Freenode

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Release: 15.0.0.0b3.dev25 on 2019-01-09 02:06:03
SHA: 4c82dda11c915a8c85fa64c1169e8a69ba406b0d
Source: https://git.openstack.org/cgit/openstack/horizon/tree/doc/source/contributor/tutorials/plugin.rst
URL: https://docs.openstack.org/horizon/latest/contributor/tutorials/plugin.html

[Gao Fei (gaofei-inspur)]

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