[PATCH v4] doc: update guideline for fix commit messages

[Sivaramakrishnan Venkat <venkatx.sivaramakrishnan@intel.com>]

Maintainers remove the Cc author line when merging the patch.
So, the guidelines is updated with a suggestion for the placement
of Cc lines in a commit message for easy merging.

Signed-off-by: Sivaramakrishnan Venkat <venkatx.sivaramakrishnan@intel.com>
---
v4:
  - Reverted removal of "Cc: stable@dpdk.org" in the commit log
v3:
  - Other samples updated to the desired format for the "Cc:" line in the commit message
v2:
  - Samples updated to the desired format for the "Cc:" line in the commit message
---
 doc/guides/contributing/patches.rst | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/guides/contributing/patches.rst b/doc/guides/contributing/patches.rst
index e286d9e6d5..7605ea4d64 100644
--- a/doc/guides/contributing/patches.rst
+++ b/doc/guides/contributing/patches.rst
@@ -271,9 +271,10 @@ Here are some guidelines for the body of a commit message:
      Update the docs, fixing description of some parameter.
 
      Fixes: abcdefgh1234 ("doc: add some parameter")
-     Cc: author@example.com
 
      Signed-off-by: Alex Smith <alex.smith@example.com>
+     ---
+     Cc: author@example.com
 
 * When fixing an error or warning it is useful to add the error message and instructions on how to reproduce it.
 
@@ -300,9 +301,10 @@ in the body of the commit message. For example::
 
      Coverity issue: 12345
      Fixes: abcdefgh1234 ("doc: add some parameter")
-     Cc: author@example.com
 
      Signed-off-by: Alex Smith <alex.smith@example.com>
+     ---
+     Cc: author@example.com
 
 
 `Bugzilla <https://bugs.dpdk.org>`_
@@ -319,9 +321,10 @@ For example::
 
     Bugzilla ID: 12345
     Fixes: abcdefgh1234 ("doc: add some parameter")
-    Cc: author@example.com
 
     Signed-off-by: Alex Smith <alex.smith@example.com>
+    ---
+    Cc: author@example.com
 
 Patch for Stable Releases
 ~~~~~~~~~~~~~~~~~~~~~~~~~
-- 
2.25.1