add a few comments to elaborate on servlet module

Author: SylvainJuge

instrumentation/jaxrs/jaxrs-2.0/jaxrs-2.0-jersey-2.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/jaxrs/v2_0/JerseyInstrumentationModule.java

@@ -29,6 +29,7 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
 
   @Override
   public String getModuleGroup() {
+    // depends on Servlet3SnippetInjectingResponseWrapper
     return "servlet";
   }
 

instrumentation/servlet/servlet-3.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/servlet/v3_0/Servlet3InstrumentationModule.java

@@ -37,6 +37,7 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
 
   @Override
   public String getModuleGroup() {
+    // depends on servlet instrumentation
     return "servlet";
   }
 

instrumentation/spring/spring-security-config-6.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/security/config/v6_0/servlet/SpringSecurityConfigServletInstrumentationModule.java

@@ -51,6 +51,7 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
 
   @Override
   public String getModuleGroup() {
+    // depends on servlet instrumentation
     return "servlet";
   }
 

instrumentation/spring/spring-web/spring-web-3.1/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/springweb/v3_1/SpringWebInstrumentationModule.java

@@ -33,6 +33,7 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
 
   @Override
   public String getModuleGroup() {
+    // depends on OpenTelemetryHandlerMappingFilter
     return "servlet";
   }
 

instrumentation/spring/spring-web/spring-web-6.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/web/v6_0/SpringWebInstrumentationModule.java

@@ -31,6 +31,7 @@ public ElementMatcher.Junction<ClassLoader> classLoaderMatcher() {
 
   @Override
   public String getModuleGroup() {
+    // depends on OpenTelemetryHandlerMappingFilter
     return "servlet";
   }