clarify comment

mapstructure.go

diff --git a/mapstructure.go b/mapstructure.go
index ecc8218..40be511 100644
--- a/mapstructure.go
+++ b/mapstructure.go
@@ -619,8 +619,7 @@
 				}
 			}
 
-			// We have an embedded field. We "squash" the fields down
-			// if specified in the tag.
+			// If "squash" is specified in the tag, we squash the field down.
 			squash := false
 			tagParts := strings.Split(fieldType.Tag.Get(d.config.TagName), ",")
 			for _, tag := range tagParts[1:] {