typo fix

doc/development/architecture.md

@@ -18,7 +18,7 @@ New releases are generally around the same time as GitLab CE releases with excep
 
 # System Layout
 
-When referring to ~git in the picures it means the home directory of the git user which is typically /home/git.
+When referring to ~git in the pictures it means the home directory of the git user which is typically /home/git.
 
 GitLab is primarily installed within the `/home/git` user home directory as `git` user.
 Within the home directory is where the gitlabhq server software resides as well as the repositories (though the repository location is configurable).