Add branch update instructions

KR155E · KR155E · commit 672207098886 · 2024-06-15T14:39:20.000+02:00
diff --git a/update-branches.md b/update-branches.md
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+git checkout hyperboy && git rebase main hyperboy && git push --force  && git checkout hyperboy-plus && git rebase main hyperboy-plus && git push --force  && git checkout hyperflash-32 && git rebase main hyperflash-32 && git push --force  && git checkout main

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	`1`	`+git checkout hyperboy && git rebase main hyperboy && git push --force && git checkout hyperboy-plus && git rebase main hyperboy-plus && git push --force && git checkout hyperflash-32 && git rebase main hyperflash-32 && git push --force && git checkout main`