Update name of Convert to MeshInstance2D button in MeshInstance2D doc

(cherry picked from commit 857e5a3bb065e8efdbb137796c3ba4946eaab99b)

doc/classes/MeshInstance2D.xml

@@ -4,7 +4,7 @@
 		Node used for displaying a [Mesh] in 2D.
 	</brief_description>
 	<description>
-		Node used for displaying a [Mesh] in 2D. Can be constructed from an existing [Sprite] via a tool in the editor toolbar. Select "Sprite" then "Convert to Mesh2D", select settings in popup and press "Create Mesh2D".
+		Node used for displaying a [Mesh] in 2D. A [MeshInstance2D] can be automatically created from an existing [Sprite] via a tool in the editor toolbar. Select the [Sprite] node, then choose [b]Sprite &gt; Convert to MeshInstance2D[/b] at the top of the 2D editor viewport.
 	</description>
 	<tutorials>
 		<link>$DOCS_URL/tutorials/2d/2d_meshes.html</link>