Polish contribution

Closes gh-4903

spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

@@ -3249,6 +3249,7 @@ Spring Boot tries to detect the following providers (in this order):
 * <<boot-features-caching-provider-hazelcast,Hazelcast>>
 * <<boot-features-caching-provider-infinispan,Infinispan>>
 * <<boot-features-caching-provider-redis,Redis>>
+* <<boot-features-caching-provider-caffeine,Caffeine>>
 * <<boot-features-caching-provider-guava,Guava>>
 * <<boot-features-caching-provider-simple,Simple>>
 
@@ -3384,6 +3385,31 @@ recommend to keep this setting enabled if you create your own `RedisCacheManager
 
 
 
+[[boot-features-caching-provider-caffeine]]
+==== Caffeine
+Caffeine is a Java 8 rewrite of Guava’s cache and will supersede the Guava support in
+Spring Boot 2.0. If Caffeine is present, a `CaffeineCacheManager` is auto-configured.
+Caches can be created on startup using the `spring.cache.cache-names` property and
+customized by one of the following (in this order):
+
+1. A cache spec defined by `spring.cache.caffeine.spec`
+2. A `com.github.benmanes.caffeine.cache.CaffeineSpec` bean is defined
+3. A `com.github.benmanes.caffeine.cache.Caffeine` bean is defined
+
+For instance, the following configuration creates a `foo` and `bar` caches with a maximum
+size of 500 and a _time to live_ of 10 minutes
+
+[source,properties,indent=0]
+----
+    spring.cache.cache-names=foo,bar
+	spring.cache.caffeine.spec=maximumSize=500,expireAfterAccess=600s
+----
+
+Besides, if a `com.github.benmanes.caffeine.cache.CacheLoader` bean is defined, it is
+automatically associated to the `CaffeineCacheManager`.
+
+
+
 [[boot-features-caching-provider-guava]]
 ==== Guava
 If Guava is present, a `GuavaCacheManager` is auto-configured. Caches can be created