Merge pull request square#2858 from franmontiel/master

Corrected javadoc of the Cookie persistent() method

okhttp/src/main/java/okhttp3/Cookie.java

@@ -100,7 +100,7 @@ public String value() {
     return value;
   }
 
-  /** Returns true if this cookie expires at the end of the current session. */
+  /** Returns true if this cookie does not expire at the end of the current session. */
   public boolean persistent() {
     return persistent;
   }