[bp-i18n-specdev] Change the rule for establishing base direction

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

== Change the rule for establishing base direction ==
I would make this rule a little clearer.

The content author must be able to indicate parts of the text where 
the base direction changes. At the block level, this should be 
achieved using attributes or metadata, and should not rely on Unicode 
control characters.

to

The content author must be able to indicate parts of the text where 
the base direction changes. At the block level, this should be 
achieved using attributes or metadata, and should not require the 
content author to use Unicode control characters to control direction.

See https://github.com/w3c/bp-i18n-specdev/issues/8
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