fixed url in readme

Author: gavlyukovskiy

azure-application-insights-spring-boot-starter/README.md

@@ -55,7 +55,7 @@ public class TelemetryController {
 
 #### Sending logs to the application insight
 
-Follow the instructions from (Spring Boot logging documentation)[https://docs.spring.io/spring-boot/docs/current/reference/html/howto-logging.html] to configure custom logback or log4j2 appender.
+Follow the instructions from [Spring Boot logging documentation](https://docs.spring.io/spring-boot/docs/current/reference/html/howto-logging.html) to configure custom logback or log4j2 appender.
 `logback-spring.xml`
 ```xml
 <appender name="aiAppender"