Migrate spring.view properties

Migrate `spring.view.prefix` and `spring.view.suffix` to
`spring.mvc.view.prefix` and `spring.mvc.view.suffix` respectively. The
former properties are still handled in a backward compatible way and are
defined as deprecated in the meta-data.

Closes gh-3250

spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -122,8 +122,8 @@ content into your application; rather pick only the properties that you need.
 	spring.mvc.message-codes-resolver-format= # PREFIX_ERROR_CODE / POSTFIX_ERROR_CODE
 	spring.mvc.ignore-default-model-on-redirect=true # if the the content of the "default" model should be ignored redirects
 	spring.mvc.async.request-timeout= # async request timeout in milliseconds
-	spring.view.prefix= # MVC view prefix
-	spring.view.suffix= # ... and suffix
+	spring.mvc.view.prefix= # MVC view prefix
+	spring.mvc.view.suffix= # ... and suffix
 
 	# SPRING RESOURCES HANDLING ({sc-spring-boot-autoconfigure}/web/ResourceProperties.{sc-ext}[ResourceProperties])
 	spring.resources.cache-period= # cache timeouts in headers sent to browser

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

@@ -1110,7 +1110,7 @@ added.
   resources and JSP pages if you are using those). It applies a prefix and a suffix to the
   view name and then looks for a physical resource with that path in the servlet context
   (defaults are both empty, but accessible for external configuration via
-  `spring.view.prefix` and `spring.view.suffix`). It can be overridden by providing a
+  `spring.mvc.view.prefix` and `spring.mvc.view.suffix`). It can be overridden by providing a
   bean of the same type.
 * A `BeanNameViewResolver` with id '`beanNameViewResolver`'. This is a useful member of the
   view resolver chain and will pick up any beans with the same name as the `View` being