Fix README formatting

Author: eleftherias

README.adoc

@@ -21,7 +21,7 @@ This Spring Session repository consists of the following modules:
 * Spring Session Hazelcast - provides `SessionRepository` implementation backed by Hazelcast and configuration support
 
 Additional Spring Session modules can be found in the https://github.com/spring-projects/spring-session-data-mongodb[spring-session-data-mongodb] repository
-and [https://github.com/spring-projects/spring-session-data-geode]spring-session-data-geode repository.
+and https://github.com/spring-projects/spring-session-data-geode[spring-session-data-geode] repository.
 
 == Getting Started