Some clarity with WP_CACHE_KEY_SALT

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Hi Daniel,

First off, a HUGE thanks for this amazing plugin.

I noticed a small thing that may be somewhat misleading. So in object-cache.php you’re saying:

# Users with setups where multiple installs share a common wp-config.php or $table_prefix
# can use this to guarantee uniqueness for the keys generated by this object cache

And in https://wordpress.org/plugins/wp-redis/installation/ #5 you state:
To use the same Redis server with multiple, discreet WordPress installs... which I believe is correct, unlike the statement in object-cache.php

In a nutshell, if one uses more than 1 WP instance on the same server with Redis object caching enabled – setting different(!) WP_CACHE_KEY_SALT constants for each instance is mandatory.