docs: fix all end of file newlines

Note: Some files are autogenerated and I did not yet
go through each source of generation to fix it there.
Instead I adjusted the filter to only exclude those
such that we can fix things in steps.

docs/en/airframes/airframe_reference.md

@@ -797,4 +797,3 @@ div.frame_variant td, div.frame_variant th {
 </tbody>
 </table>
 </div>
-