Fix docos references to @ConfigurationProperties(prefix="...")

Fixes gh-629

Author: Dave Syer

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

@@ -47,7 +47,7 @@ rules of thumb:
   {sc-spring-boot-autoconfigure}/web/ServerProperties.{sc-ext}[`ServerProperties`]
   and read from there the available external configuration options. The
   `@ConfigurationProperties` has a `name` attribute which acts as a prefix to external
-  properties, thus `ServerProperties` has `name="server"` and its configuration properties
+  properties, thus `ServerProperties` has `prefix="server"` and its configuration properties
   are `server.port`, `server.address` etc. In a running Actuator app look at the
   `configprops` endpoint.
 * Look for use of `RelaxedEnvironment` to pull configuration values explicitly out of the

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

@@ -424,7 +424,7 @@ the configuration of your application. For example:
 [source,java,indent=0]
 ----
 	@Component
-	@ConfigurationProperties(name="connection")
+	@ConfigurationProperties(prefix="connection")
 	public class ConnectionSettings {
 
 		private String username;
@@ -512,7 +512,7 @@ annotations to your `@ConfigurationProperties` class:
 [source,java,indent=0]
 ----
 	@Component
-	@ConfigurationProperties(name="connection")
+	@ConfigurationProperties(prefix="connection")
 	public class ConnectionSettings {
 
 		@NotNull