Merge tag 'v1.44.0rc2' into develop

Synapse 1.44.0rc2 (2021-09-30)
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Bugfixes
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- Fix a bug introduced in v1.44.0rc1 which caused the experimental [MSC2716](https://github.com/matrix-org/matrix-doc/pull/2716) `/batch_send` endpoint to return a 500 error. ([\#10938](https://github.com/matrix-org/synapse/issues/10938))
- Fix a bug introduced in v1.44.0rc1 which prevented sending presence events to application services. ([\#10944](https://github.com/matrix-org/synapse/issues/10944))

Improved Documentation
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- Minor updates to the installation instructions. ([\#10919](https://github.com/matrix-org/synapse/issues/10919))