Polish "Remove '.' and '-' reference in the EndpointId javadoc"

See gh-19101

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/EndpointId.java

@@ -27,9 +27,9 @@ import org.apache.commons.logging.LogFactory;
 import org.springframework.util.Assert;
 
 /**
- * An identifier for an actuator endpoint. Endpoint IDs may contain only letters and numbers.
- * They must begin with a lower-case letter. Case and syntax
- * characters are ignored when comparing endpoint IDs.
+ * An identifier for an actuator endpoint. Endpoint IDs may contain only letters and
+ * numbers. They must begin with a lower-case letter. Case and syntax characters are
+ * ignored when comparing endpoint IDs.
  *
  * @author Phillip Webb
  * @since 2.0.6