To reflect reviewer's comment.

Co-authored-by: Felicia Lim <[email protected]>

index.bs

@@ -1268,7 +1268,7 @@ class MixPresentationOBU() {
 <dfn noexport>count_label</dfn> indicates the number of labels in different languages.
 
 <dfn noexport>annotations_language</dfn> specifies the language which both [=localized_presentation_annotations=] and [=localized_element_annotations=] are written in. It SHALL conform to [[!BCP-47]]. The same language SHALL NOT be duplicated in this array. 
-- The labels of the i-th [=localized_presentation_annotations=] and [=localized_element_annotations=] SHALL be written in the language indicated by the i-th [=language_label=], where i = 0, 1, ..., [=count_label=] -1.
+- The i-th [=localized_presentation_annotations=] and [=localized_element_annotations=] SHALL be written in the language indicated by the i-th [=annotations_language=], where i = 0, 1, ..., [=count_label=] -1.
 
 <dfn noexport>localized_presentation_annotations</dfn> provides a description for this [=Mix Presentation=], and is informational metadata that an IA parser SHOULD refer to when selecting the [=Mix Presentation=] to use. The metadata MAY also be used by the playback system to display information to the user but is not used in the rendering or mixing process to generate the final output audio signal.