Open Stack

Diane made a few comments on the usage of non-breaking space while
reviewing:
https://review.openstack.org/#/c/81056/

I've put these now in a separate patch and updated the Conventions as
well to document non-breaking space at:
https://wiki.openstack.org/wiki/Documentation/Conventions#Numbers_and_units

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Numbers and units

Separate numbers and their units by a non-breaking space. It is advised
to define an entitiy at the top of the xml file for the non-breaking space.

Example:

<!ENTITY nbsp " ">
...
1 TB, is 1024 GB.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


Is that correct usage and documentation?

Andreas
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