SpringBoot Documentation of spring.redis.url incorrectly states that it does not override spring.redis.user

This PR updates Javadoc for the RedisProperties.url field to include username in override targets as it seems to override it.

A Redis URI seems to be able to include other properties like database, but they are not included in override targets. It seems to be inconsistent, but I'm not sure if it's intentional.

Comment From: wilkinsona

When merging forwards, the property becomes spring.data.redis.url.

Comment From: wilkinsona

Thanks, @izeye.

I'm not sure if the things that Lettuce supports in the URI are standard or Lettuce-specific. I've found https://www.iana.org/assignments/uri-schemes/prov/redis. It includes the database in the URI but it's only provisional and hasn't been updated since 2015.

WDYT, @mp911de?