Add P6Spy comment to parent POM

Insert a comment labeling the p6spy dependency in microsphere-spring-parent/pom.xml. This is a documentation-only change (no dependency or configuration was modified).

Author: mercyblitz

microsphere-spring-parent/pom.xml

@@ -65,6 +65,7 @@
                 <scope>import</scope>
             </dependency>
 
+            <!-- P6Spy -->
             <dependency>
                 <groupId>p6spy</groupId>
                 <artifactId>p6spy</artifactId>