Inconsistent `TTL`: DOCS

[vanshavenger]

Steps to reproduce

SET newkey "value" TTL newkey value

Expected output In the DOCS

(error) ERROR syntax error

Observed output in the CLI

(error) ERR wrong number of arguments for 'ttl' command

Expectations for resolution

This issue will be considered resolved when the following things are done

1. changes in the docs to (error) ERR wrong number of arguments for 'ttl' command, to make it consistent with the DOCs.

I found this, when i was lookinf for the commands which output golang error.