[bp-i18n-specdev] Should include advice on what "White-space" is.

spemberton has just created a new issue for 
https://github.com/w3c/bp-i18n-specdev:

== Should include advice on what "White-space" is. ==
Many specs talk about white space, or "space-separated" things (indeed
 this very spec does).

They then either fail to list what white-space means, or include a 
list of characters that they are willing to accept as white space.

The spec community really needs more help in defining white-space. In 
particular, Unicode has specifications for white-space, that (imo) 
ought to be used more by spec writers, so that "white-space" is 
whatever Unicode says it is, rather than everyone making it up 
themselves.

See https://github.com/w3c/bp-i18n-specdev/issues/15
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