rn-38: fix typos as suggested by Kaartic

Author: chriscool

rev_news/drafts/edition-38.md

@@ -220,7 +220,7 @@ Kaartic's patch series will probably also be merged there too.
 http://www.worldhello.net/gotgit/. Meanwhile, I wrote an e-book for
  GitHub: http://www.worldhello.net/gotgithub; it is also written in
  Chinese, but not published because I feel it is hard to track changes
- of GitHub UI and the book will become obsolte very quickly.
+ of GitHub UI and the book will become obsolete very quickly.
 
  I became Git l10n coordinator to help Junio for l10n management in
  early 2012. Now there are 11 fully supported language packs for Git,
@@ -236,7 +236,7 @@ Kaartic's patch series will probably also be merged there too.
 - Git central workflow is something like Gerrit. No forking before
  sending pull request, no special git hook on client side, no
  "Change-Id" in the commit message, and we use pull request for
- review. We also developped a client side program named "git-mm"
+ review. We also developed a client side program named "git-mm"
  to help our users to manage multiple git modules, or a single
  git repository.