route: fix spelling of 'represents' in RIBType doc

Change-Id: I5f4ca1a70c90cfa5d8c95ef4d5e8fbfe7f855b1d
GitHub-Last-Rev: 5ada0f59cff33210223892efa84452c90d11688e
GitHub-Pull-Request: golang/net#69
Reviewed-on: https://go-review.googlesource.com/c/net/+/229224
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

route/route.go

@@ -88,7 +88,7 @@ func (m *RouteMessage) Marshal() ([]byte, error) {
 	return m.marshal()
 }
 
-// A RIBType reprensents a type of routing information base.
+// A RIBType represents a type of routing information base.
 type RIBType int
 
 const (