docs: Apply some basic organization to the process guide

Put like documents together, with the essential ones at the top, and split
the TOC into sections.

Reviewed-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index 22797a1..56ce661 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -1,6 +1,6 @@
 .. _changes:
 
-Minimal requerements to compile the Kernel
+Minimal requirements to compile the Kernel
 ++++++++++++++++++++++++++++++++++++++++++
 
 Intro