Typo fix (#136)

"Copy you.." to "Copy your.."

docs/modules/core/pages/ui/hud.adoc

@@ -108,7 +108,7 @@ guiNode.attachChild(hudText);
 
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-The BitmapFont object `guiFont` is a default font provided by SimpleApplication. Copy you own fonts as .fnt plus .png files into the `assets/Interface/Fonts` directory and load them like this:
+The BitmapFont object `guiFont` is a default font provided by SimpleApplication. Copy your own fonts as .fnt plus .png files into the `assets/Interface/Fonts` directory and load them like this:
 
 [source]
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