The updated Formats document will address this.
First, follow print for placement of the arrows - above or below the sentence. If the arrows are inconsistently placed in print, it is suggested that they all be treated the same in braille with a TN stating this change.
I'm attaching the correct braille.
The arrow mode indicator (dots 1245) is followed by the arrowhead (dots 135). So in the example of the right pointing arrow, line mode is used first...a dot 5 followed by dots 25 for the length of the arrow. The line (arrow shaft) is then followed by the arrowhead. Line mode starts grade 1 mode so no grade 1 indicator is required.
In the second example, the arrowhead comes first, so a grade 1 indicator is required. Then the arrow shaft indicator is used.