Remove redaction section from ts tracing docs

[asiFarran]

It appears that there is no support for marking fields for redaction in ts yet.

The docs section looks like it was just copied from the go one, and is at the moment incorrect and created a false assumption.

This section of the docs can be restored when redaction support actually exists.

[encore-cla[bot]]

All committers have signed the CLA.

[marcuskohlberg]

Thanks!