fix README typos

Teapot/README.md

@@ -1,6 +1,6 @@
 Teapot
 ======
-Teapot is an Android C++ sample that draw a Teapot mesh using GLES 2.0 API and [NativeActivity](http://developer.android.com/reference/android/app/NativeActivity.html).
+Teapot is an Android C++ sample that draws a Teapot mesh using GLES 2.0 API and [NativeActivity](http://developer.android.com/reference/android/app/NativeActivity.html).
 
 Pre-requisites
 --------------

bitmap-plasma/README.md

@@ -1,6 +1,6 @@
 Bitmap Plasma
 =============
-Bitmap Plasma is an Android sample that uses JNI to renders a plasma effect in a Android [Bitmap](http://developer.android.com/reference/android/graphics/Bitmap.html) from C code.
+Bitmap Plasma is an Android sample that uses JNI to render a plasma effect in an Android [Bitmap](http://developer.android.com/reference/android/graphics/Bitmap.html) from C code.
 
 Pre-requisites
 --------------

endless-tunnel/README.md

@@ -3,7 +3,7 @@ Endless Tunnel
 Endless Tunnel is a sample game that shows how to:
 - use the Android Studio C++ support
 - implement a game using Android native glue
-- implement joystick support, including robust DPAD navigation for no-touch screens
+- implement joystick support, including robust DPAD navigation for non-touch screens
 
 It is NOT the goal of this sample to show the best way to write the
 game logic, load resources, etc. The game itself was intentionally
@@ -47,7 +47,7 @@ Most of this code was written by [Bruno Oliveira](https://plus.google.com/+Bruno
 
 Walkthrough
 -----------
-Source code are under app, it only contains C++ code, which is
+Source code is under app, it only contains C++ code, which is
 sitting at its default location (same as for other samples) at
 app/jni.
 
@@ -77,7 +77,7 @@ scene.
 
 Input arrives by way of the engine_handle_input function, which
 does some basic input classification and delivers the input to
-the scene manager. Incidentally, here we also synthethise DPAD events based
+the scene manager. Incidentally, here we also synthesise DPAD events based
 on the joystick hat axes (many game controllers generate hat events
 when you press the directional pad), because that way we can use that
 directional pad to drive UI navigation in the main screen.

hello-gl2/README.md

@@ -1,6 +1,6 @@
 Hello GL2
 =========
-Hello GL2 is an Android C++ sample that draw a triangle using GLES 2.0 API.
+Hello GL2 is an Android C++ sample that draws a triangle using GLES 2.0 API.
 
 It uses JNI to do the rendering in C++ over a
 [GLSurfaceView](http://developer.android.com/reference/android/opengl/GLSurfaceView.html)

native-activity/README.md

@@ -1,6 +1,6 @@
 Native Activity
 ===============
-Native Activity is an Android sample that initializes a GLES 2.0 context and read accelerometer value from C code using [Native Activity](http://developer.android.com/reference/android/app/NativeActivity.html).
+Native Activity is an Android sample that initializes a GLES 2.0 context and reads accelerometer data from C code using [Native Activity](http://developer.android.com/reference/android/app/NativeActivity.html).
 
 Pre-requisites
 --------------

native-audio/README.md

@@ -1,6 +1,6 @@
 Native Audio
 ============
-Native Audio is an Android sample that play and record sounds with the C++ OpenSLES API using JNI.
+Native Audio is an Android sample that plays and records sounds with the C++ OpenSLES API using JNI.
 
 Pre-requisites
 --------------

native-media/README.md

@@ -1,6 +1,6 @@
 Native Media
 ============
-Native Media is an Android sample that uses OpenMAX AL to a play video.
+Native Media is an Android sample that uses OpenMAX AL to play a video.
 
 Note: This sample requires an MPEG-2 Transport Stream file to be
 placed in /sdcard/NativeMedia.ts and encoded as:

native-plasma/README.md

@@ -1,6 +1,6 @@
 Native Plasma
 =============
-Native Plasma is an Android sample that render a plasma effect in a Bitmap from C code using [Native Activity](http://developer.android.com/reference/android/app/NativeActivity.html).
+Native Plasma is an Android sample that renders a plasma effect in a Bitmap from C code using [Native Activity](http://developer.android.com/reference/android/app/NativeActivity.html).
 
 Pre-requisites
 --------------

san-angeles/README.md

@@ -1,8 +1,8 @@
 San Angeles
 ===========
-San Angeles is a Android port of a demo that uses GLES C/API to render a procedural scene.
+San Angeles is an Android port of a demo that uses GLES C/API to render a procedural scene.
 
-See the original [README](app/src/main/jni/README.txt) more details about the original GLES port.
+See the original [README](app/src/main/jni/README.txt) for more details about the original GLES port.
 
 Pre-requisites
 --------------