fix typo in docs

CHANGELOG.md

@@ -58,7 +58,7 @@ Changes by Guillaume Farhi-Rivasseau :
     Staring channel is respected.  
     Disabled by default.
 - Added support for stopping capture after given timeout  
-    Use -t X (as in stotimeout) to stop capture after X seconds.  
+    Use -t X (as in timeout) to stop capture after X seconds.  
     No additionnal packets will be captured after timeout.   
     The program will stop running when it recieves a packet after the timeout.  
 - Added support for stopping capture after given number of accepted frames