docs: Update documentation on building with openharmony support

Update documentation on building with openharmony support after !250 (merged) and https://gitlab.eclipse.org/eclipse/oniro-core/meta-openharmony/-/merge_requests/65 have landed

Signed-off-by: Bernhard Rosenkränzer bernhard.rosenkraenzer.ext@huawei.com

requested review from @esben, @thierrye, and @robertd

assigned to @bero

approved this merge request

approved this merge request

added 62 commits

• 4ffbcb47...c49aafdb - 61 commits from branch eclipse/oniro-core:kirkstone
• d8d96784 - docs: Update documentation on building with openharmony support

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