srcDir, trgDir, dir vs just dir

Hi all,

One more issue in the specification (editorial):

In the section about Segmentation Modification we have the following PR:

"If the directionality attributes, srcDir, trgDir, or dir differ the Modifier MUST insert Unicode bidirectional control characters
[UAX #9] to secure proper directionality in the <segment> and its children."

The srcDir and trgDir are not used in <segment>, <source>, <target>, or <ignorable>, therefore they are not relevant here. Only dir
(which can be used in <source> and <target>) is relevant.

I suggest the following new text (with additional changes to be consistent with the other PRs):

"If the directionality attributes dir differ Modifiers MUST insert Unicode bidirectional control characters [UAX #9] to ensure
proper directionality in the <source> or <target> elements."

Cheers,
-yves