Update docs: adopt common expressions to encourage readers to check projects' documentation

- Replace links to the documentation with ones to projects' README files, if these have been linked to the project directly

Signed-off-by: Suguru Hirahara <acioustick@noreply.codeberg.org>

docs/configuring-playbook-synapse-simple-antispam.md

@@ -2,7 +2,9 @@
 
 The playbook can install and configure [synapse-simple-antispam](https://github.com/t2bot/synapse-simple-antispam) for you.
 
-See the project's documentation to learn what it does and why it might be useful to you. In short, it lets you fight invite-spam by automatically blocking invitiations from a list of servers specified by you (blacklisting).
+It lets you fight invite-spam by automatically blocking invitiations from a list of servers specified by you (blacklisting).
+
+See the project's [documentation](https://github.com/t2bot/synapse-simple-antispam/blob/master/README.md) to learn what it does and why it might be useful to you.
 
 ## Adjusting the playbook configuration