doc: missing behavior documentation when setting queueTTL to 0 (#643)

The queueTTL option documentation is missing a crucial piece of information: when set to 0, queued requests never expire.

Author: scottinet

doc/7/core-classes/kuzzle/constructor/index.md

@@ -45,7 +45,7 @@ Kuzzle SDK instance options.
 | `deprecationWarning`   | <pre>boolean</pre><br />(`true`) | Show deprecation warning in development (hidden either way in production)                                                     |
 | `eventTimeout`         | <pre>number</pre><br/>(`200`)    | Time (in ms) during which a similar event is ignored                                                                          |
 | `offlineMode`          | <pre>string</pre><br/>(`manual`) | Offline mode configuration. Can be `manual` or `auto`                                                                         |
-| `queueTTL`             | <pre>number</pre><br/>(`120000`) | Time a queued request is kept during offline mode, in milliseconds                                                            |
+| `queueTTL`             | <pre>number</pre><br/>(`120000`) | Time a queued request is kept during offline mode, in milliseconds. Set it to `0` to keep queued requests indefinitely        |
 | `queueMaxSize`         | <pre>number</pre><br/>(`500`)    | Number of maximum requests kept during offline mode                                                                           |
 | `replayInterval`       | <pre>number</pre><br/>(`10`)     | Delay between each replayed requests, in milliseconds                                                                         |
 | `requestTimeout`       | <pre>number</pre><br/>           | Default time (in ms) during which a request will still be waited to be resolved. Set it `-1` if you want to wait indefinitely |

doc/7/essentials/offline-tools/index.md

@@ -65,7 +65,9 @@ Default value: `500`
 
 ### queueTTL
 
-A writable `number` defining the time in milliseconds a queued request is kept in the `offlineQueue`.
+A writable `number` defining the time in milliseconds a queued request is kept in the `offlineQueue`.  
+
+Setting this parameter to `0` disables this behavior, and prevents the SDK from expiring queued requests.
 
 Default value: `120000`