Fix typo

xrd · xrd · commit 9de20b78f5dc · 2014-05-19T14:17:46.000-07:00
opts should be used, not apk.
diff --git a/docs/android_docs.md b/docs/android_docs.md
@@ -98,7 +98,7 @@ Appium::Driver.new(opts).start_driver
 
 # Start Android driver
 opts = { caps: { platformName: :android, app: '/path/to/my.apk' } }
-Appium::Driver.new(apk).start_driver
+Appium::Driver.new(opts).start_driver
 ```
 
 __Parameters:__
