docs: Change console to shell and remove unused elements (#5960)

docs/networking/port-forwarding.md

@@ -29,14 +29,14 @@ The supported syntax variations for the `--tcp` and `--udp` flag are:
 
 Forward the remote TCP port `8080` to local port `8000`:
 
-```console
+```shell
 coder port-forward myworkspace --tcp 8000:8080
 ```
 
 Forward the remote TCP port `3000` and all ports from `9990` to `9999`
 to their respective local ports.
 
-```console
+```shell
 coder port-forward myworkspace --tcp 3000,9990-9999
 ```
 
@@ -89,7 +89,7 @@ Valid `share` values include `owner` - private to the user, `authenticated` - ac
 First, [configure SSH](../ides.md#ssh-configuration) on your
 local machine. Then, use `ssh` to forward like so:
 
-```console
+```shell
 ssh -L 8080:localhost:8000 coder.myworkspace
 ```