Docs: Restructure the documents

Restructure the file category to let it more friendly to users.

Signed-off-by: Summer Qin <summer.qin@arm.com>
Change-Id: I7ced0e2d700ce03423e472e0098608f3445ba169
diff --git a/docs/contributing/coding_guide.rst b/docs/contributing/coding_guide.rst
index 099d3b3..f208fc0 100644
--- a/docs/contributing/coding_guide.rst
+++ b/docs/contributing/coding_guide.rst
@@ -18,7 +18,7 @@
 The guidance below is provided as a help. It isn't meant to be a definitive
 list.
 
-As implied in the :doc:`contributing guide </docs/contributing/contributing>`
+As implied in the :doc:`contributing guide </docs/contributing/contributing_process>`
 maintainers have the right to decide on what's acceptable in case of any
 divergence.
 
@@ -76,4 +76,4 @@
 
 --------------
 
-*Copyright (c) 2018-2020, Arm Limited. All rights reserved.*
+*Copyright (c) 2018-2021, Arm Limited. All rights reserved.*