[Chore] Fix comment's grammar and modifier's order (#138)

apm-commons/apm-datacarrier/src/main/java/org/apache/skywalking/apm/commons/datacarrier/consumer/BulkConsumePool.java

@@ -45,7 +45,7 @@ public class BulkConsumePool implements ConsumerPool {
     }
 
     @Override
-    synchronized public void add(String name, Channels channels, IConsumer consumer) {
+    public synchronized void add(String name, Channels channels, IConsumer consumer) {
         MultipleChannelsConsumer multipleChannelsConsumer = getLowestPayload();
         multipleChannelsConsumer.addNewTarget(channels, consumer);
     }

apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/context/ContextManager.java

@@ -169,7 +169,7 @@ public class ContextManager implements BootService {
     }
 
     /**
-     * If not sure has the active span, use this method, will be cause NPE when has no active span, use
+     * Using this method will cause NPE if active span does not exist. If one is not sure whether there is an active span, use
      * ContextManager::isActive method to determine whether there has the active span.
      */
     public static AbstractSpan activeSpan() {

apm-sniffer/apm-sdk-plugin/dubbo-2.7.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/asf/dubbo/DubboInterceptor.java

@@ -53,7 +53,7 @@ public class DubboInterceptor implements InstanceMethodsAroundInterceptor {
      * inject to the {@link RpcContext#attachments} for transport to provider side.
      * <p>
      * <h2>Provider:</h2> The serialized trace context data will extract from
-     * {@link RpcContext#attachments}. current trace segment will ref if the serialize context data is not null.
+     * {@link RpcContext#attachments}. current trace segment will ref if the serialization context data is not null.
      */
     @Override
     public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allArguments, Class<?>[] argumentsTypes,

apm-sniffer/apm-sdk-plugin/dubbo-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/asf/dubbo3/DubboInterceptor.java

@@ -54,7 +54,7 @@ public class DubboInterceptor implements InstanceMethodsAroundInterceptor {
      * inject to the {@link RpcContext#getClientAttachment} for transport to provider side.
      * <p>
      * <h2>Provider:</h2> The serialized trace context data will extract from
-     * {@link RpcContext#getServerAttachment}. current trace segment will ref if the serialize context data is not
+     * {@link RpcContext#getServerAttachment}. current trace segment will ref if the serialization context data is not
      * null.
      */
     @Override