Docs: Rewrite/abbreviate home page introduction

Bug: 20753555
Change-Id: Ie0fa0c5158b0b3005672e80089f4d5aedfdb47c4
diff --git a/src/source/index.jd b/src/source/index.jd
index 34531f0..1941ed6 100644
--- a/src/source/index.jd
+++ b/src/source/index.jd
@@ -17,7 +17,7 @@
     limitations under the License.
 -->
 <p>
-Android is an open-source software stack created for a wide array of devices
+Android is an open source software stack created for a wide array of devices
 with different form factors. The primary purposes of Android are to create an
 open software platform available for carriers, OEMs, and developers to make
 their innovative ideas a reality and to introduce a successful,
@@ -47,7 +47,7 @@
 </p>
 <p>The companies that have invested in Android have done so on its merits
 because we believe an open platform is necessary. Android is
-intentionally and explicitly an open-source -- as opposed to a free software --
+intentionally and explicitly an open source -- as opposed to a free software --
 effort; a group of organizations with shared needs has pooled
 resources to collaborate on a single implementation of a shared product.
 The Android philosophy is pragmatic, first and foremost. The objective is