[docs] Use 0 as version placeholder instead of a made up number.

# The version info for the project you're documenting, acts as replacement for

# |version| and |release|, also used in various other places throughout the

# built documents.

# built documents. These are currently set to zero because we don't use them.

# Should somebody consider in the future to change them, they need to be updated

# everytime a new release comes out.

#

# The short version.

#version = '8'

#version = '0'

# The full version, including alpha/beta/rc tags.

#release = '8'

#release = '0'

# The language for content autogenerated by Sphinx. Refer to documentation

# for a list of supported languages.