Updated Updating an imported repository via git commands (markdown)

Updating-a-sub-moduled-Git-repository.md

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+For Cxbx-Reloaded, we maintain our own forks of sub-moduled libraries. This allows us to integrate them nicely into our build process, while also providing the ability to easily synchronize upstream changes.
+
+## Updating the Submodule Repository
+From the sub-module directory (import/*)
+```
+git remote add upstream <upstream url>
+git fetch upstream && git merge upstream/master
+git push
+```
+
+At this point, our sub-module fork is synchronized with the latest upstream changes, but we still need to tell the Cxbx-Reloaded repository to use the new commits, to do this, use any git client of choice (or the command line) to stage the sub-module's directory, and commit/push as normal.

Updating-an-imported-repository-via-git-commands.md

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-Luke summarized it to this :
-
-> git remote add upstream https://github.com/crosire/d3d8to9
-> git fetch upstream
-> git rebase upstream/master
-> git push -f
-
-> Now our own submodule fork is updated to upstream with our own cxbx-r changes
-
-> then in the Cxbx-Reloaded root
-
-> git add import/d3d8to9
-> then git commit and git push as normal