docs: getting error in “Configure Client HTTP Idle Timeout” section of CTP task doc

*Description*:
Working locally without external load balancer support, so I’m running the following command
`openssl s_client -crlf -connect localhost:8443`

And receiving the following error:

`40411FDC01000000:error:8000003D:system library:BIO_connect:Connection refused:crypto/bio/bio_sock2.c:114:calling connect()
40411FDC01000000:error:10000067:BIO routines:BIO_connect:connect error:crypto/bio/bio_sock2.c:116:
40411FDC01000000:error:8000003D:system library:BIO_connect:Connection refused:crypto/bio/bio_sock2.c:114:calling connect()
40411FDC01000000:error:10000067:BIO routines:BIO_connect:connect error:crypto/bio/bio_sock2.c:116:
connect:errno=61`

I think I am encountering this issue because the doc does not explain:
- [ ] How to configure port 443
- [ ] How to portforward(set up 8443) for users that are testing locally and are not using external load balancer support

Page: https://gateway.envoyproxy.io/docs/tasks/traffic/client-traffic-policy/