Fix various spelling mistakes and typos

Change-Id: Ie4ff17b5abdc1ac4c7c378ead91ee9065e4fd32f
diff --git a/src/devices/input/keyboard-devices.jd b/src/devices/input/keyboard-devices.jd
index 267ae42..821e201 100644
--- a/src/devices/input/keyboard-devices.jd
+++ b/src/devices/input/keyboard-devices.jd
@@ -27,7 +27,7 @@
 <p>Android supports a variety of keyboard devices including special function
 keypads (volume and power controls), compact embedded QWERTY keyboards,
 and fully featured PC-style external keyboards.</p>
-<p>This document decribes physical keyboards only.  Refer to the Android SDK
+<p>This document describes physical keyboards only.  Refer to the Android SDK
 for information about soft keyboards (Input Method Editors).</p>
 <h2 id="keyboard-classification">Keyboard Classification</h2>
 <p>An input device is classified as a keyboard if either of the following