Update README.md

punctuate

Author: ashumz

docs/README.md

@@ -54,7 +54,7 @@ We also have an in-depth [setup and
 configuration](https://coder.com/docs/code-server/v3.11.0/guide) guide.
 
 ## TLS and authentication (beta)
-To add TLS and authentication out of the box, use [code-server --link](https://coder.com/docs/code-server/v3.11.0/link)
+To add TLS and authentication out of the box, use [code-server --link](https://coder.com/docs/code-server/v3.11.0/link).
 
 
 ## Questions?