Bugfixes

--------

- Fix bug when rejecting remote invites. ([\#4527](https://github.com/matrix-org/synapse/issues/4527))
- Fix incorrect rendering of server capabilities. ([81b7e7eed](https://github.com/matrix-org/synapse/commit/81b7e7eed323f55d6550e7a270a9dc2c4c7b0fe0))

Improved Documentation
----------------------

- Add documentation on enabling ACME support when upgrading to v0.99. ([\#4528](https://github.com/matrix-org/synapse/issues/4528))
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