Small grammar fixes to the ACME v1 deprecation notice (#6944)

Some small fixes to the copy in #6907.

INSTALL.md

@@ -420,11 +420,10 @@ so, you will need to edit `homeserver.yaml`, as follows:
   Note that, as pointed out in that document, this feature will not
   work with installs set up after November 2020. 
   
-  If you are using your
-  own certificate, be sure to use a `.pem` file that includes the full
-  certificate chain including any intermediate certificates (for
-  instance, if using certbot, use `fullchain.pem` as your certificate,
-  not `cert.pem`).
+  If you are using your own certificate, be sure to use a `.pem` file that
+  includes the full certificate chain including any intermediate certificates
+  (for instance, if using certbot, use `fullchain.pem` as your certificate, not
+  `cert.pem`).
 
 For a more detailed guide to configuring your server for federation, see
 [federate.md](docs/federate.md)

changelog.d/6944.doc

@@ -0,0 +1 @@
+Small grammatical fixes to the ACME v1 deprecation notice.

synapse/handlers/acme.py

@@ -27,11 +27,11 @@ logger = logging.getLogger(__name__)
 
 ACME_REGISTER_FAIL_ERROR = """
 --------------------------------------------------------------------------------
-Failed to register with the ACME provider. This is likely happening because the install
-is new, and ACME v1 has been deprecated by Let's Encrypt and is disabled for installs set
-up after November 2019.
-At the moment, Synapse doesn't support ACME v2. For more info and alternative solution,
-check out https://github.com/matrix-org/synapse/blob/master/docs/ACME.md#deprecation-of-acme-v1
+Failed to register with the ACME provider. This is likely happening because the installation
+is new, and ACME v1 has been deprecated by Let's Encrypt and disabled for
+new installations since November 2019.
+At the moment, Synapse doesn't support ACME v2. For more information and alternative
+solutions, please read https://github.com/matrix-org/synapse/blob/master/docs/ACME.md#deprecation-of-acme-v1
 --------------------------------------------------------------------------------"""