Fix method name in Caching reference documentation.

Closes #2837

Author: mp911de

src/main/asciidoc/reference/redis-cache.adoc

@@ -58,7 +58,7 @@ 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: