Docs: clarify LineMaterial.linewidth units in relation to worldUnits … (#29864)

* Docs: clarify LineMaterial.linewidth units in relation to worldUnits property

* Docs: LineMaterial - lineWidth tweak

docs/examples/en/lines/LineMaterial.html

@@ -64,7 +64,7 @@
 		<p>The size of the gap. Default is `1`.</p>
 
 		<h3>[property:Float linewidth]</h3>
-		<p>Controls line thickness. Default is `1`.</p>
+		<p>Controls line thickness in CSS pixel units when [page:worldUnits] is `false` (default), or in world units when [page:worldUnits] is `true`. Default is `1`.</p>
 
 		<h3>[property:Vector2 resolution]</h3>
 		<p>