Announce LinkedIn Messaging bridging support

Related to https://github.com/spantaleev/matrix-docker-ansible-deploy/pull/1242

CHANGELOG.md

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+# 2021-08-23
+
+## LinkedIn bridging support via beeper-linkedin
+
+Thanks to [Alexandar Mechev](https://github.com/apmechev), the playbook can now install the [beeper-linkedin](https://gitlab.com/beeper/linkedin) bridge for bridging to [LinkedIn](https://www.linkedin.com/) Messaging.
+
+This brings the total number of bridges supported by the playbook up to 20. See all supported bridges [here](docs/configuring-playbook.md#bridging-other-networks).
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+To get started with bridging to LinkedIn, see [Setting up Beeper LinkedIn bridging](docs/configuring-playbook-bridge-beeper-linkedin.md).
+
+
 # 2021-08-20
 
 # Sygnal upgraded - ARM support and no longer requires a database

docs/configuring-playbook-bridge-beeper-linkedin.md

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 # Setting up Beeper Linkedin (optional)
 
-The playbook can install and configure [beeper-linkedin](https://gitlab.com/beeper/linkedin) for you. This bridge is based on the mautrix-python framework and can be configured in a similar way to the other mautrix bridges
+The playbook can install and configure [beeper-linkedin](https://gitlab.com/beeper/linkedin) for you, for bridging to [LinkedIn](https://www.linkedin.com/) Messaging. This bridge is based on the mautrix-python framework and can be configured in a similar way to the other mautrix bridges
 
 See the project's [documentation](https://gitlab.com/beeper/linkedin/-/blob/master/README.md) to learn what it does and why it might be useful to you.