update docs

Signed-off-by: Nshawn_he <shawn.he@huawei.com>

en/application-dev/reference/apis/js-apis-i18n.md

@@ -67,7 +67,7 @@ Obtains the localized script for the specified country.
   ```
 
 
-## i18n.isRTL<sup>8+</sup>
+## i18n.isRTL<sup>7+</sup>
 
 isRTL(locale: string): boolean
 
@@ -1258,7 +1258,7 @@ Checks whether the position specified by the offset is a text boundary. If **tru
   ```
 
 
-## i18n.is24HourClock<sup>8+</sup>
+## i18n.is24HourClock<sup>7+</sup>
 
 is24HourClock(): boolean
 
@@ -1277,7 +1277,7 @@ Checks whether the 24-hour clock is used.
   ```
 
 
-## i18n.set24HourClock<sup>8+</sup>
+## i18n.set24HourClock<sup>7+</sup>
 
 set24HourClock(option: boolean): boolean
 
@@ -1394,7 +1394,7 @@ Obtains the first language in the preferred language list.
   ```
 
 
-## i18n.getTimeZone<sup>8+</sup>
+## i18n.getTimeZone<sup>7+</sup>
 
 getTimeZone(zoneID?: string): TimeZone
 

en/application-dev/reference/apis/js-apis-intl.md

 # Internationalization – intl
 
 > ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
-> - The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+> - The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 > 
 > - This module contains standard i18n APIs, which are defined in ECMA 402.