Update WebTwain_Buffer.md

fix typo

Author: kyle-ds

info/api/WebTwain_Buffer.md

@@ -895,7 +895,7 @@ GetSelectedImagesSize(type: Dynamsoft.DWT.EnumDWT_ImageType | number): number;
 
 **Parameters**
 
-`type`: Sepcify the expected file type.
+`type`: Specify the expected file type.
 
 **Availability**
 
@@ -2368,4 +2368,4 @@ interface DocumentInfo {
 </tr>
 
 </table>
-</div>
+</div>