README.md: Hint at "git request-pull"

Github pull requests are not recommended. When a Github contributor
wants to send patches from its repo, hint at "git request-pull"
generated emails to guide them on the right way.

Cc: Dmitry Baryshkov <dbaryshkov@gmail.com>
Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/README.md

@@ -26,7 +26,8 @@ to share your patches, this is preferred for patch sets consisting of more than
 
 Note, it is discouraged to send patches via GitHub pull request system. Such
 patches get less attention from developers and can be mishandled or not
-reviewed properly. Please use emails instead.
+reviewed properly. Please use emails instead. For exemple, you can use
+'git request-pull' to generate an email referencing your git repository.
 
 Other services like GitLab, repo.or.cz or self-hosted setups are of course accepted as well,
 'git fetch <remote>' works the same on all of them. We recommend GitHub because it is free, easy