doc(redis instrumentation): Use latest options in readme (#1058)
doc(redis instrumentation): Use latest options in readme (#1058)

* docs(redis instrumentation): Use latest options in readme

There is no option `enable_statement_obfuscation` for
`OpenTelemetry::Instrumentation::Redis`.
Replace example with option `db_statement` in README.

* Cleanup doc

Co-authored-by: Francis Bogsanyi <670cd5605830f6b63d443687caab7fc24c3610f8@shopify.com>
open-telemetry/opentelemetry-ruby,open-telemetry/opentelemetry-ruby