Declare Spring 'release' Repository to ressolve all Spring documentation resources required to build project documentation.

spring-geode-docs/spring-geode-docs.gradle

@@ -9,6 +9,10 @@ apply plugin: 'io.spring.convention.spring-test'
 
 description = "Generate Javadoc and Reference Documentation on Spring Boot for Apache Geode"
 
+repositories {
+	maven { url "https://repo.spring.io/release" }
+}
+
 dependencies {
 
 	compile project(':spring-geode-starter')