Update index.md

diff --git a/markdown/application-development/index.md b/markdown/application-development/index.md
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 To help you navigate through this guide, it is divided into several
 large parts. Each part addresses a particular broad topic concerning
-GStreamer appliction development. The parts of this guide are laid out
+GStreamer application development. The parts of this guide are laid out
 in the following order:
 
 [About GStreamer][about] gives you an overview of GStreamer, its design