Fix comment about ParallelGCThreads
Fix comment about ParallelGCThreads

patch by zznate; reviewed by pauloricardomg for CASSANDRA-10702

ollie314/cassandra,ifesdjeen/cassandra,tjake/cassandra,mshuler/cassandra,josh-mckenzie/cassandra,snazy/cassandra,mkjellman/cassandra,yukim/cassandra,aweisberg/cassandra,tommystendahl/cassandra,DikangGu/cassandra,driftx/cassandra,phact/cassandra,adelapena/cassandra,weideng1/cassandra,adelapena/cassandra,sharvanath/cassandra,chbatey/cassandra-1,yhnishi/cassandra,scylladb/scylla-tools-java,vaibhi9/cassandra,carlyeks/cassandra,exoscale/cassandra,joesiewert/cassandra,michaelsembwever/cassandra,DikangGu/cassandra,weideng1/cassandra,tongjixianing/projects,apache/cassandra,vramaswamy456/cassandra,belliottsmith/cassandra,snazy/cassandra,mkjellman/cassandra,ben-manes/cassandra,carlyeks/cassandra,iamaleksey/cassandra,instaclustr/cassandra,scaledata/cassandra,bdeggleston/cassandra,snazy/cassandra,tongjixianing/projects,exoscale/cassandra,juiceblender/cassandra,stef1927/cassandra,christian-esken/cassandra,krummas/cassandra,cooldoger/cassandra,belliottsmith/cassandra,Instagram/cassandra,jrwest/cassandra,ben-manes/cassandra,jrwest/cassandra,Jollyplum/cassandra,aweisberg/cassandra,Jollyplum/cassandra,apache/cassandra,apache/cassandra,blerer/cassandra,weideng1/cassandra,ptnapoleon/cassandra,iamaleksey/cassandra,kgreav/cassandra,yukim/cassandra,adejanovski/cassandra,vaibhi9/cassandra,cooldoger/cassandra,yhnishi/cassandra,nitsanw/cassandra,mike-tr-adamson/cassandra,aweisberg/cassandra,tommystendahl/cassandra,jasonstack/cassandra,driftx/cassandra,thobbs/cassandra,modempachev4/kassandra,strapdata/cassandra,strapdata/cassandra,belliottsmith/cassandra,beobal/cassandra,RyanMagnusson/cassandra,Imran-C/cassandra,jbellis/cassandra,szhou1234/cassandra,spodkowinski/cassandra,blambov/cassandra,hhorii/cassandra,tommystendahl/cassandra,vramaswamy456/cassandra,thobbs/cassandra,driftx/cassandra,szhou1234/cassandra,sedulam/CASSANDRA-12201,bdeggleston/cassandra,pauloricardomg/cassandra,szhou1234/cassandra,mike-tr-adamson/cassandra,sedulam/CASSANDRA-12201,newrelic-forks/cassandra,RyanMagnusson/cassandra,pauloricardomg/cassandra,carlyeks/cassandra,jeffjirsa/cassandra,aweisberg/cassandra,newrelic-forks/cassandra,jasonstack/cassandra,phact/cassandra,mike-tr-adamson/cassandra,thelastpickle/cassandra,jeromatron/cassandra,Instagram/cassandra,jasonwee/cassandra,bdeggleston/cassandra,nitsanw/cassandra,adelapena/cassandra,WorksApplications/cassandra,aureagle/cassandra,jbellis/cassandra,instaclustr/cassandra,thobbs/cassandra,pcmanus/cassandra,ifesdjeen/cassandra,jeffjirsa/cassandra,knifewine/cassandra,michaelsembwever/cassandra,hhorii/cassandra,ifesdjeen/cassandra,hengxin/cassandra,Imran-C/cassandra,stef1927/cassandra,christian-esken/cassandra,iamaleksey/cassandra,bcoverston/cassandra,pthomaid/cassandra,beobal/cassandra,josh-mckenzie/cassandra,Jaumo/cassandra,spodkowinski/cassandra,ben-manes/cassandra,knifewine/cassandra,jasobrown/cassandra,WorksApplications/cassandra,tongjixianing/projects,bcoverston/cassandra,yukim/cassandra,chbatey/cassandra-1,tjake/cassandra,jeffjirsa/cassandra,mkjellman/cassandra,newrelic-forks/cassandra,clohfink/cassandra,jeromatron/cassandra,blerer/cassandra,pcmanus/cassandra,aboudreault/cassandra,jasonwee/cassandra,pauloricardomg/cassandra,kgreav/cassandra,yukim/cassandra,blambov/cassandra,belliottsmith/cassandra,jasonstack/cassandra,jasobrown/cassandra,blerer/cassandra,driftx/cassandra,instaclustr/cassandra,stef1927/cassandra,mshuler/cassandra,joesiewert/cassandra,mshuler/cassandra,clohfink/cassandra,Instagram/cassandra,vaibhi9/cassandra,chbatey/cassandra-1,tjake/cassandra,bdeggleston/cassandra,thelastpickle/cassandra,jrwest/cassandra,krummas/cassandra,mambocab/cassandra,jasobrown/cassandra,phact/cassandra,blambov/cassandra,instaclustr/cassandra,modempachev4/kassandra,juiceblender/cassandra,snazy/cassandra,WorksApplications/cassandra,ptnapoleon/cassandra,jasonwee/cassandra,scaledata/cassandra,aureagle/cassandra,josh-mckenzie/cassandra,pthomaid/cassandra,Imran-C/cassandra,clohfink/cassandra,jeffjirsa/cassandra,cooldoger/cassandra,josh-mckenzie/cassandra,beobal/cassandra,ptnapoleon/cassandra,michaelsembwever/cassandra,juiceblender/cassandra,kgreav/cassandra,Jollyplum/cassandra,beobal/cassandra,nitsanw/cassandra,pcmanus/cassandra,jrwest/cassandra,scylladb/scylla-tools-java,Jaumo/cassandra,adelapena/cassandra,bmel/cassandra,strapdata/cassandra,krummas/cassandra,thelastpickle/cassandra,sharvanath/cassandra,cooldoger/cassandra,bcoverston/cassandra,vramaswamy456/cassandra,scylladb/scylla-tools-java,modempachev4/kassandra,mambocab/cassandra,tjake/cassandra,strapdata/cassandra,exoscale/cassandra,jasobrown/cassandra,RyanMagnusson/cassandra,adejanovski/cassandra,aboudreault/cassandra,jbellis/cassandra,adejanovski/cassandra,yhnishi/cassandra,scaledata/cassandra,bmel/cassandra,tommystendahl/cassandra,apache/cassandra,WorksApplications/cassandra,christian-esken/cassandra,juiceblender/cassandra,mshuler/cassandra,krummas/cassandra,joesiewert/cassandra,clohfink/cassandra,mkjellman/cassandra,aureagle/cassandra,pthomaid/cassandra,mambocab/cassandra,pauloricardomg/cassandra,szhou1234/cassandra,mike-tr-adamson/cassandra,bmel/cassandra,blambov/cassandra,spodkowinski/cassandra,ollie314/cassandra,thelastpickle/cassandra,iamaleksey/cassandra,DikangGu/cassandra,sharvanath/cassandra,hengxin/cassandra,hhorii/cassandra,blerer/cassandra,jeromatron/cassandra,aboudreault/cassandra,sedulam/CASSANDRA-12201,Jaumo/cassandra,ollie314/cassandra,stef1927/cassandra,scylladb/scylla-tools-java,Instagram/cassandra,spodkowinski/cassandra,bcoverston/cassandra,ifesdjeen/cassandra,michaelsembwever/cassandra,hengxin/cassandra,kgreav/cassandra,knifewine/cassandra