Fix comments

src/core/lib/surface/server.c

@@ -175,7 +175,7 @@ struct registered_method {
   char *host;
   grpc_server_register_method_payload_handling payload_handling;
   uint32_t flags;
-  /* one request matcher per method per cq */
+  /* one request matcher per method */
   request_matcher request_matcher;
   registered_method *next;
 };
@@ -204,7 +204,7 @@ struct grpc_server {
   gpr_mu mu_call;   /* mutex for call-specific state */
 
   registered_method *registered_methods;
-  /** one request matcher for unregistered methods per cq */
+  /** one request matcher for unregistered methods */
   request_matcher unregistered_request_matcher;
   /** free list of available requested_calls indices */
   gpr_stack_lockfree *request_freelist;

src/cpp/server/server_builder.cc

@@ -119,6 +119,7 @@ std::unique_ptr<Server> ServerBuilder::BuildAndStart() {
     for (auto plugin = plugins_.begin(); plugin != plugins_.end(); plugin++) {
       if ((*plugin).second->has_sync_methods()) {
         thread_pool.reset(CreateDefaultThreadPool());
+        has_sync_methods = true;
         break;
       }
     }