Source linting: pre-commit

howto/code/lint/index.rst
howto/code/lint/pre-commit.rst
------------------------------
  o Document the pre-commit hook for linting and source cleanup.
  o Added a howto cookbook until cleaner commands can be added.

Change-Id: I41fa897ae4a9ae54f133ac6a3fbb23633bc0d648
Signed-off-by: Joey Armstrong <jarmstrong@linuxfoundation.org>
diff --git a/howto/code/lint/index.rst b/howto/code/lint/index.rst
index c061006..01e4f71 100644
--- a/howto/code/lint/index.rst
+++ b/howto/code/lint/index.rst
@@ -6,6 +6,7 @@
 
    lint-helm.rst
    fix-errors
+   pre-commit
 
 
 ======================================
@@ -41,4 +42,5 @@
 
 - :ref:`Makefile Target lint-chart`
 - :ref:`Makefile Target lint-helm`
-
+- :ref:`Makefile Target lint-robot`
+- :ref:`Makefile Target lint-pre-commit`