Reorganized text. Added new info about desktops

Author: serbanghita

docs/KNOWN_LIMITATIONS.md

@@ -1,10 +1,11 @@
 **Known limitations**
 
-* User-Agent and HTTP headers sniffing is overall a non reliable method of detecting a mobile device.
+* Mobile Detect script was designed to detect `mobile` devices. Implicitly other devices are considered to be `desktop`.
+* User-Agent and HTTP headers sniffing is a non reliable method of detecting a mobile device.
 * If the mobile browser is set on `Desktop mode`, the Mobile Detect script has no way of knowing that the device is `mobile`.
-* There are hundreds of devices launched every month, we cannot keep a 100% up to date detection rate.
 * Some touchscreen devices (eg. Microsoft Surface) are tough to detect as mobile since they can be used in a laptop mode.
 * Detecting the device brand (eg. Apple, Samsung, HTC) is not 100% reliable.
-* We don't monitor the quality of the 3rd party tools based on Mobile Detect script. We cannot guarantee that they are using 
-the class properly or if they provide the latest version.
+* We don't monitor the quality of the 3rd party tools based on Mobile Detect script. 
+We cannot guarantee that they are using the class properly or if they provide the latest version.
 * Version `2.x` is made to be PHP 5.3 compatible because of the backward compatibility changes of PHP.
+* There are hundreds of devices launched every month, we cannot keep a 100% up to date detection rate.