More clarification in metrics export docs

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

@@ -1076,13 +1076,17 @@ used by default if you are on Java 8 or if you are using Dropwizard metrics.
 
 [[production-ready-metric-writers]]
 === Metric writers, exporters and aggregation
-Spring Boot provides a couple of implementations of a marker interface called `Exporter`
-which can be used to copy metric readings from the in-memory buffers to a place where they
-can be analyzed and displayed. Indeed, if you provide a `@Bean` that implements the
-`MetricWriter` interface and mark it `@ExportMetricWriter`, then it will automatically be
-hooked up to an `Exporter` and fed metric updates every 5 seconds (configured via
-`spring.metrics.export.delay-millis`). In addition, any `MetricReader` that you define and
-mark as `@ExportMetricReader` will have its values exported by the default exporter.
+
+Spring Boot provides a couple of implementations of a marker interface
+called `Exporter` which can be used to copy metric readings from the
+in-memory buffers to a place where they can be analyzed and
+displayed. Indeed, if you provide a `@Bean` that implements the
+`MetricWriter` interface (or `GaugeWriter` for simple use cases) and
+mark it `@ExportMetricWriter`, then it will automatically be hooked up
+to an `Exporter` and fed metric updates every 5 seconds (configured
+via `spring.metrics.export.delay-millis`). In addition, any
+`MetricReader` that you define and mark as `@ExportMetricReader` will
+have its values exported by the default exporter.
 
 The default exporter is a `MetricCopyExporter` which tries to optimize itself by not
 copying values that haven't changed since it was last called (the optimization can be