Corrected typo.

src/docs/asciidoc/jme3/beginner/hello_terrain.adoc

@@ -25,7 +25,7 @@ If you get an error when trying to create your `ImageBasedHeightMap` object, you
 
 [TIP]
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-To use the example assets in a new jMonkeyEngine SDK project, btn:[RMB] select your project, select `menu:Propertie[Libraries]` and in  the `Compile` tab, press btn:[Add Library] and add the `jme3-test-data` library.
+To use the example assets in a new jMonkeyEngine SDK project, btn:[RMB] select your project, select `menu:Properties[Libraries]` and in  the `Compile` tab, press btn:[Add Library] and add the `jme3-test-data` library.
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