Fix typo in comment

GNUmakefile.in

@@ -111,7 +111,7 @@ distclean maintainer-clean:
 installcheck-resgroup:
 	$(MAKE) -C src/test/isolation2 $@
 
-# Create or destory a demo cluster.
+# Create or destroy a demo cluster.
 create-demo-cluster:
 	$(MAKE) -C gpAux/gpdemo create-demo-cluster
 

src/backend/cdb/dispatcher/cdbdisp_query.c

@@ -1470,7 +1470,7 @@ CdbDispatchCopyStart(struct CdbCopy *cdbCopy, Node *stmt, int flags)
 	}
 
 	/*
-	 * Notice: Do not call cdbdisp_finishCommand to destory dispatcher state,
+	 * Notice: Do not call cdbdisp_finishCommand to destroy dispatcher state,
 	 * following PQputCopyData/PQgetCopyData will be called on those connections
 	 */
 	cdbCopy->dispatcherState = ds;