[bp-i18n-specdev] Change rule to allow surrogates

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

== Change rule to allow surrogates ==
I think this rule is incorrect in the "Including and excluding 
character ranges" section of checklist.

Specifications MUST NOT allow the use of surrogate code points.

I think it should be MUST ALLOW.

See https://github.com/w3c/bp-i18n-specdev/issues/11
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