Update MeshInstance3D.xml

fixed a grammatical error

Author: koolaidxk1d

doc/classes/MeshInstance3D.xml

@@ -4,7 +4,7 @@
 		Node that instances meshes into a scenario.
 	</brief_description>
 	<description>
-		MeshInstance3D is a node that takes a [Mesh] resource and adds it to the current scenario by creating an instance of it. This is the class most often used render 3D geometry and can be used to instance a single [Mesh] in many places. This allows reusing geometry, which can save on resources. When a [Mesh] has to be instantiated more than thousands of times at close proximity, consider using a [MultiMesh] in a [MultiMeshInstance3D] instead.
+		MeshInstance3D is a node that takes a [Mesh] resource and adds it to the current scenario by creating an instance of it. This is the class most often used to render 3D geometry and can be used to instance a single [Mesh] in many places. This allows reusing geometry, which can save on resources. When a [Mesh] has to be instantiated more than thousands of times at close proximity, consider using a [MultiMesh] in a [MultiMeshInstance3D] instead.
 	</description>
 	<tutorials>
 		<link title="3D Material Testers Demo">https://godotengine.org/asset-library/asset/2742</link>