Documentation improvement of DataSource configuration

Closes gh-2126

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

@@ -1103,7 +1103,8 @@ samples for more detail and to see it in action.
 To override the default settings just define a `@Bean` of your own of type `DataSource`.
 Spring Boot provides a utility builder class `DataSourceBuilder` that can be used
 to create one of the standard ones (if it is on the classpath), or you can just create
-your own, and bind it to a set of `Environment` properties e.g.
+your own, and bind it to a set of `Environment` properties as explained in
+<<spring-boot-features.adoc#boot-features-external-config-3rd-party-configuration>>, e.g.
 
 [source,java,indent=0,subs="verbatim,quotes,attributes"]
 ----

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

@@ -571,6 +571,28 @@ TIP: Using `@ConfigurationProperties` also allows you to generate meta-data file
 be used by IDEs. See the <<configuration-metadata>> appendix for details.
 
 
+[[boot-features-external-config-3rd-party-configuration]]
+==== Third-party configuration
+
+You can also use that feature for third-party components: in that case, you can't obviously
+add a `@ConfigurationProperties` to it if you don't have access to the source code or if that
+component does not know about Spring Boot.
+
+To configure a bean from the `Environment` properties, add `@ConfigurationProperties` to its
+bean registration:
+
+[source,java,indent=0]
+----
+
+	@ConfigurationProperties(prefix = "foo")
+	@Bean
+	public FooComponent fooComponent() {
+		...
+	}
+----
+
+Any property defined with the `foo` prefix will be mapped onto that `FooComponent` bean in a
+similar manner as the `ConnectionSettings` example above.
 
 [[boot-features-external-config-relaxed-binding]]
 ==== Relaxed binding
@@ -1416,7 +1438,7 @@ Production database connections can also be auto-configured using a pooling
 * Lastly, if Commons DBCP2 is available we will use it
 
 If you use the `spring-boot-starter-jdbc` or `spring-boot-starter-data-jpa`
-'`starter POMs`' you will automcatically get a dependency to `tomcat-jdbc`.
+'`starter POMs`' you will automatically get a dependency to `tomcat-jdbc`.
 
 NOTE: Additional connection pools can always be configured manually. If you define your
 own `DataSource` bean, auto-configuration will not occur.
@@ -1434,7 +1456,9 @@ in `application.properties`:
 ----
 
 See {sc-spring-boot-autoconfigure}/jdbc/DataSourceProperties.{sc-ext}[`DataSourceProperties`]
-for more of the supported options.
+for more of the supported options. Note also that you can configure any of the `DataSource`
+implementation specific properties via `+spring.datasource.*+`: refer to the documentation
+of the connection pool implementation you are using for more details.
 
 TIP: You often won't need to specify the `driver-class-name` since Spring boot can deduce
 it for most databases from the `url`.