docs: prepare for RC 3 (#5713)

* docs: prepare for RC 3

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* docs: one more rc 3 update

* chore: bump to 3.0.0rc3

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

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Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
3 files changed