Add upgrade docs
Currently how you upgrade is documented in the
pulp_upgrade booleans documented on ansible-pulp here: https://github.com/pulp/ansible-pulp
The issue is that there isn't any guidance on upgrading Pulp in the pulp docs itself. We should write some!
Note: some content from the 3.0.1 release announcement could be reused for this: https://hackmd.io/MJ9xsAUQT5OP_w6kbZGNKg
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