fix the comments

src/core/ngx_cycle.c

diff --git a/src/core/ngx_cycle.c b/src/core/ngx_cycle.c
index 2fd20b0..84be875 100644
--- a/src/core/ngx_cycle.c
+++ b/src/core/ngx_cycle.c
@@ -594,7 +594,7 @@
 
     /* close and delete stuff that lefts from an old cycle */
 
-    /* close the unneeded listening sockets */
+    /* close the unnecessary listening sockets */
 
     ls = old_cycle->listening.elts;
     for (i = 0; i < old_cycle->listening.nelts; i++) {
@@ -610,7 +610,7 @@
     }
 
 
-    /* close the unneeded open files */
+    /* close the unnecessary open files */
 
     part = &old_cycle->open_files.part;
     file = part->elts;