Merge branch '3.3.x'

Author: philwebb

spring-boot-project/spring-boot-docs/src/docs/antora/modules/reference/pages/features/external-config.adoc

@@ -964,7 +964,7 @@ Support for binding from environment variables is applied to the `systemEnvironm
 
 
 [[features.external-config.typesafe-configuration-properties.relaxed-binding.maps-from-environment-variables]]
-==== Binding Maps from environment variables
+==== Binding Maps From Environment Variables
 
 When Spring Boot binds an environment variable to a property class, it lowercases the environment variable name before binding.
 Most of the time this detail isn't important, except when binding to `Map` properties.