fix comment

src/event/modules/ngx_devpoll_module.c

diff --git a/src/event/modules/ngx_devpoll_module.c b/src/event/modules/ngx_devpoll_module.c
index 48815b4..4c72356 100644
--- a/src/event/modules/ngx_devpoll_module.c
+++ b/src/event/modules/ngx_devpoll_module.c
@@ -264,7 +264,7 @@
         return NGX_OK;
     }
 
-    /* restore the paired event if it exists */
+    /* restore the pair event if it exists */
 
     if (event == POLLIN) {
         e = c->write;