Fixed broken single quotes.

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 '`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:Propertie[Libraries]` and in  the `Compile` tab, press btn:[Add Library] and add the `jme3-test-data` library.
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@@ -285,7 +285,7 @@ Use `setWrap(WrapMode.Repeat)` to make the small texture fill the wide area. If
 
 == What is a Terrain?
 
-Internally, the generated terrain mesh is broken down into tiles and blocks. This is an optimization to make culling easier. You do not need to worry about “tiles and blocks too much, just use recommended values for now – 64 is a good start.
+Internally, the generated terrain mesh is broken down into tiles and blocks. This is an optimization to make culling easier. You do not need to worry about '`tiles`' and '`blocks`' too much, just use recommended values for now – 64 is a good start.
 
 Let's assume you want to generate a 512x512 terrain. You already have created the heightmap object. Here are the steps that you perform everytime you create a new terrain.