there is chance that the distro install python as python3, in that case
the shebang of
```
```
in build.py won't work.
Signed-off-by: Kefu Chai <tchaikov@gmail.com>

this allows us to use sphinx-build-3, as user might already in a python3
world, and distros, like fedora 28, tend to add a "-3" suffix to sphinx-build.
Signed-off-by: Kefu Chai <tchaikov@gmail.com>

Issue #873 indicates that this class is no longer required,
as it has been superseded by a new API.

Fixes #873

In the Format API section, it says fmt:print writes to a file, but it
writes to a stream as referenced from fopen(3), "stream open
functions". Also in the Safety section a typo; tim should be time.

Signed-off-by: Daniela Engert <dani@ngrt.de>

Signed-off-by: Daniela Engert <dani@ngrt.de>

Signed-off-by: Daniela Engert <dani@ngrt.de>

Signed-off-by: Daniela Engert <dani@ngrt.de>

Take #2 of n
Signed-off-by: Daniela Engert <dani@ngrt.de>