Add processResources Gradle task to replace property and tag placeholders in source files.

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

@@ -1,3 +1,5 @@
+import org.apache.tools.ant.filters.ReplaceTokens
+
 apply plugin: 'io.spring.convention.docs'
 apply plugin: 'io.spring.convention.spring-test'
 
@@ -55,3 +57,16 @@ javadoc {
 		]
 	}
 }
+
+processResources {
+	eachFile { file ->
+		if (!file.name.endsWith(".jks")) {
+			file.filter ReplaceTokens, tokens: [
+				'project-dir' : rootProject.projectDir.path,
+				'project-version' : project.version,
+				'docs-dir' : rootProject.projectDir.path + '/spring-geode-docs',
+				'samples-dir' : rootProject.projectDir.path + '/spring-geode-samples'
+			]
+		}
+	}
+}