Fix doc/sockets.md

doc/sockets.md

@@ -4,11 +4,12 @@ Sockets Handler
 This handler allows you to write your logs to sockets using [fsockopen](http://php.net/fsockopen)
 or [pfsockopen](http://php.net/pfsockopen).
 
+Persistent sockets are mainly useful in web environments where you gain some performance not closing/opening
+the connections between requests.
+
 Basic Example
 -------------
 
-This example e persistent connections:
-
 ```php
 <?php