Merge pull request CyC2018#455 from linkwk7/fix-typo

Fix typo

Author: CyC2018

notes/Socket.md

@@ -178,12 +178,12 @@ else if ( ret == 0 )
 else
 {
     // If we detect the event, zero it out so we can reuse the structure
-    if ( pfd[0].revents & POLLIN )
-        pfd[0].revents = 0;
+    if ( fds[0].revents & POLLIN )
+        fds[0].revents = 0;
         // input event on sock1
 
-    if ( pfd[1].revents & POLLOUT )
-        pfd[1].revents = 0;
+    if ( fds[1].revents & POLLOUT )
+        fds[1].revents = 0;
         // output event on sock2
 }
 ```

notes/计算机操作系统.md

@@ -613,7 +613,7 @@ void philosopher(int i) {
         think();
         take_two(i);
         eat();
-        put_tow(i);
+        put_two(i);
     }
 }
 
@@ -625,7 +625,7 @@ void take_two(int i) {
     down(&s[i]);
 }
 
-void put_tow(i) {
+void put_two(i) {
     down(&mutex);
     state[i] = THINKING;
     test(LEFT);