Update documentation after OpenHarmony upgrade

added to epic &24

set weight to 2

changed milestone to %goofy alpha

changed iteration to Oniro Core Iterations May 1, 2022 - May 31, 2022

added teamopenharmony label

changed iteration to Oniro Core Iterations Jun 1, 2022 - Jun 30, 2022

assigned to @esben

added Doing label

set weight to 1

We need to add the following

• Documentation on the use of ${OPENHARMONY_VERSION} to select OpenHarmony version
• Fixup the documentation on building OHOS with prebuilts images, where tarball names SDK output filenames must be fixed.

changed the description

closed with merge request eclipse/oniro4openharmony/meta-openharmony!20 (merged)

removed Doing label