Minor link fixes

sdk-basic-tutorial-debugging-tools.md

@@ -178,4 +178,4 @@ This tutorial has shown:
   - How to get pipeline graphs with the
     `GST_DEBUG_DUMP_DOT_DIR` environment variable.
 
-It has been a pleasure having you here, and see you soon!
+It has been a pleasure having you here, and see you soon!

sdk-basic-tutorial-platform-specific-elements.md

@@ -16,7 +16,7 @@ you some of their peculiarities.
 ### `glimagesink`
 
 This video sink is based on
-[OpenGL](http://en.wikipedia.org/wiki/OpenGL) or [OpenGL ES](http://en.wikipedia.org/wiki/OpenGL ES). It supports rescaling
+[OpenGL](http://en.wikipedia.org/wiki/OpenGL) or [OpenGL ES](https://en.wikipedia.org/wiki/OpenGL_ES). It supports rescaling
 and filtering of the scaled image to alleviate aliasing. It implements
 the VideoOverlay interface, so the video window can be re-parented
 (embedded inside other windows). This is the video sink recommended on

sdk-installing-for-android-development.md

@@ -18,7 +18,7 @@ needs to have installed:
     you have at least one Android SDK platform installed with API
     version 9 or higher.
 
-Optionally, you can use the \[Android Studio\] (FIX LINK). As stated in
+Optionally, you can use the [Android Studio] (https://developer.android.com/studio/index.html). As stated in
 the Android documentation, *developing in Android Studio is highly
 recommended and is the fastest way to get started*.