Update docs on using Thmyeleaf 3 to reference latest version

Closes gh-7183

Author: rajadileepkolli

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

@@ -1464,7 +1464,7 @@ By default, `spring-boot-starter-thymeleaf` uses Thymeleaf 2.1. If you are using
 [source,xml,indent=0,subs="verbatim,quotes,attributes"]
 ----
 	<properties>
-		<thymeleaf.version>3.0.0.RELEASE</thymeleaf.version>
+		<thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
 		<thymeleaf-layout-dialect.version>2.0.3</thymeleaf-layout-dialect.version>
 	</properties>
 ----