Move Renderers page at the top of the Rendering section

This page is usually meant to be read first to give an overview,
while other pages are on more specific subjects.

- Rename to "Overview of renderers" to be more descriptive.

tutorials/rendering/index.rst

@@ -12,8 +12,8 @@ Rendering
    :maxdepth: 1
    :name: toc-learn-features-rendering
 
+   renderers
    viewports
    multiple_resolutions
    jitter_stutter
    compositor
-   renderers

tutorials/rendering/renderers.rst

@@ -1,7 +1,7 @@
 .. _doc_renderers:
 
-Renderers
-=========
+Overview of renderers
+=====================
 
 .. seealso::
 
@@ -112,7 +112,7 @@ Feature comparison
 
 This is not a complete list of the features of each renderer. If a feature is
 not listed here, it is available in all renderers, though it may be much faster
-on some renderers. For a list of *all* features in Godot, see :ref:`doc_list_of_features`. 
+on some renderers. For a list of *all* features in Godot, see :ref:`doc_list_of_features`.
 
 Hardware with RenderingDevice support is hardware which can run Vulkan, Direct3D
 12, or Metal.