Update xml-ids.md

Author: lpugin

docs/structure/xml-ids.md

@@ -9,7 +9,7 @@ parent: "General structure"
 
 Exporting to MEI from MuseScore generates MEI IDs (i.e., `@xml:id`s). These are used for internal referencing (e.g., the `@startid` on a `dynam` referencing the `chord` it is attached to), but they can also be used for referencing MEI elements externally.
 
-The MEI IDs are randomly generated. This means that exporting a file twice will have different MEI IDs. However, it is possible to seed the random generator with a value to be given in a `xml:id` property in the MuseScore metatag properties. When exporting to MEI, the value in the metatag is set as the `@xml:id` of the root `mei` element. It is preserved at import too, meaning the the `mei@xml:id` is set as `xml:id` metatag property in the imported MuseScore file.
+The MEI IDs are randomly generated. This means that exporting a file twice will have different MEI IDs. However, it is possible to seed the random generator with a value to be given in a `xml:id` property in the MuseScore metatag properties. When exporting to MEI, the value in the metatag is set as the `@xml:id` of the root `mei` element. It is preserved at import too, meaning that the `mei@xml:id` is set as `xml:id` metatag property in the imported MuseScore file.
 
 Some elements that do not have a corresponding MuseScore object have no `@xml:id`. These are: