Change Codahale to Dropwizard in Javadoc.

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/reader/MetricRegistryMetricReader.java

@@ -45,7 +45,7 @@ import com.codahale.metrics.Sampling;
 import com.codahale.metrics.Timer;
 
 /**
- * A Spring Boot {@link MetricReader} that reads metrics from a Codahale
+ * A Spring Boot {@link MetricReader} that reads metrics from a Dropwizard
  * {@link MetricRegistry}. Gauges and Counters are reflected as a single value. Timers,
  * Meters and Histograms are expanded into sets of metrics containing all the properties
  * of type Number.

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/writer/DropwizardMetricWriter.java

@@ -31,7 +31,7 @@ import com.codahale.metrics.MetricRegistry;
 import com.codahale.metrics.Timer;
 
 /**
- * A {@link MetricWriter} that send data to a Codahale {@link MetricRegistry} based on a
+ * A {@link MetricWriter} that send data to a Dropwizard {@link MetricRegistry} based on a
  * naming convention:
  *
  * <ul>