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 <francis.bogsanyi@shopify.com>

instrumentation/redis/README.md

@@ -47,8 +47,10 @@ end
 OpenTelemetry::SDK.configure do |c|
   c.use 'OpenTelemetry::Instrumentation::Redis', {
     # The obfuscation of arguments in the db.statement attribute is enabled by default.
-    # To disable, set enable_statement_obfuscation to false.
-    enable_statement_obfuscation: true,
+    # To include the full query, set db_statement to :include.
+    # To obfuscate, set db_statement to :obfuscate.
+    # To omit the attribute, set db_statement to :omit.
+    db_statement: :include,
   }
 end
 ```