HID: fix help texts in Kconfig

The help text for CONFIG_HID might imply for someone that
it's necessary to enable it for any keyboard or mouse
attached to the system. This is obviously not correct, so
fix it to avoid confusing the users.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/Kconfig

@@ -9,11 +9,18 @@ config HID
 	depends on INPUT
 	default y
 	---help---
-	  Say Y here if you want generic HID support to connect keyboards,
-	  mice, joysticks, graphic tablets, or any other HID based devices
-	  to your computer. You also need to select particular types of
-	  HID devices you want to compile support for, in the particular
-	  driver menu (USB, Bluetooth)
+	  A human interface device (HID) is a type of computer device that
+	  interacts directly with and takes input from humans. The term "HID"
+	  most commonly used to refer to the USB-HID specification, but other
+	  devices (such as, but not strictly limited to, Bluetooth) are
+	  designed using HID specification (this involves certain keyboards,
+	  mice, tablets, etc). This option compiles into kernel the generic
+	  HID layer code (parser, usages, etc.), which can then be used by
+	  transport-specific HID implementation (like USB or Bluetooth).
+
+	  For docs and specs, see http://www.usb.org/developers/hidpage/
+
+	  If unsure, say Y
 
 endmenu