Fix typo in target_cache_memory_usage docs

docs/usage/configuration/config_documentation.md

@@ -1434,7 +1434,7 @@ number of entries that can be stored.
  Please see the [Config Conventions](#config-conventions) for information on how to specify memory size and cache expiry
  durations.
  * `max_cache_memory_usage` sets a ceiling on how much memory the cache can use before caches begin to be continuously evicted.
- They will continue to be evicted until the memory usage drops below the `target_memory_usage`, set in
+ They will continue to be evicted until the memory usage drops below the `target_cache_memory_usage`, set in
  the setting below, or until the `min_cache_ttl` is hit. There is no default value for this option.
  * `target_cache_memory_usage` sets a rough target for the desired memory usage of the caches. There is no default value
  for this option.