Fix method name in Caching reference documentation.

Closes #2837

Author: mgleshop

src/main/antora/modules/ROOT/pages/redis/redis-cache.adoc

@@ -61,7 +61,7 @@ The following example shows how to set a static prefix:
 [source,java]
 ----
 // static key prefix
-RedisCacheConfiguration.defaultCacheConfig().prefixKeysWith("(͡° ᴥ ͡°)");
+RedisCacheConfiguration.defaultCacheConfig().prefixCacheNameWith("(͡° ᴥ ͡°)");
 
 The following example shows how to set a computed prefix: