update: this line is inconsistent with docs in v1

See https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.2-Release-Notes#deprecations-in-spring-boot-22

Close #64

Author: codespearhead

src/docs/asciidoc/faq.adoc

@@ -264,7 +264,7 @@ RequestHeader set X-Forwarded-Prefix "/custom-path"
 server.use-forward-headers=true
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 * If this is not enough, Spring Framework provides a `ForwardedHeaderFilter`. You can register it as a Servlet Filter in your application by setting server.forward-headers-strategy is set to FRAMEWORK.
-* Since Spring Boot 3.2, this is the new property to handle reverse proxy headers:
+* Since Spring Boot 2.2, this is the new property to handle reverse proxy headers:
 
 [source,properties]
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