[Metainfo] Fix incorrect tags in AppStream specification

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
Update ChangeLog for 6.1

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Metainfo] Fix more xml tag issues

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Adjust old figures 8 and 9 a bit

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>
[Rachana] Add Section and Dagger glyphs

Signed-off-by: Rajeesh K Nambiar <rajeeshknambiar@gmail.com>