collate/colltab: fix a comment typo.
collate/colltab: fix a comment typo.

Change-Id: I151c71a91ee6211bfe5a3e68048aaf92979eec73
Reviewed-on: https://go-review.googlesource.com/10620
Reviewed-by: Marcel van Lohuizen <a22d082192f3ccf984644a4f482781f4c2d65180@golang.org>

cmars/tools,cmars/tools,golang/text,cmars/tools,npchp110/text,cmars/tools