Fix typo

See gh-1129

spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/AbstractCacheInterceptor.java

@@ -69,7 +69,7 @@ abstract class AbstractCacheInterceptor<O extends AbstractJCacheOperation<A>, A
 	/**
 	 * Convert the collection of caches in a single expected element.
 	 * <p>Throw an {@link IllegalStateException} if the collection holds more than one element
-	 * @return the singe element or {@code null} if the collection is empty
+	 * @return the single element or {@code null} if the collection is empty
 	 */
 	static Cache extractFrom(Collection<? extends Cache> caches) {
 		if (CollectionUtils.isEmpty(caches)) {