collate/colltab: fix a comment typo.

Change-Id: I151c71a91ee6211bfe5a3e68048aaf92979eec73
Reviewed-on: https://go-review.googlesource.com/10620
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/collate/colltab/collelem.go b/collate/colltab/collelem.go
index 48ab2f8..880952c 100644
--- a/collate/colltab/collelem.go
+++ b/collate/colltab/collelem.go
@@ -190,7 +190,7 @@
 	return 0
 }
 
-// CCC returns the canoncial combining class associated with the underlying character,
+// CCC returns the canonical combining class associated with the underlying character,
 // if applicable, or 0 otherwise.
 func (ce Elem) CCC() uint8 {
 	if ce&ceType3or4 != 0 {