Merge pull request #428 from tacker66/git-for-windows

Give more details on Windows system-level config file.

Author: ben

book/01-introduction/sections/first-time-setup.asc

@@ -18,7 +18,9 @@ Each level overrides values in the previous level, so values in `.git/config` tr
 
 On Windows systems, Git looks for the `.gitconfig` file in the `$HOME` directory (`C:\Users\$USER` for most people).
 It also still looks for `/etc/gitconfig`, although it's relative to the MSys root, which is wherever you decide to install Git on your Windows system when you run the installer.
-However, if you are using Git for Windows 2.x, it is `C:\Documents and Settings\All Users\Application Data\Git\config` on Windows XP, and it is `C:\ProgramData\Git\config` on Windows Vista and newer.
+If you are using Git for Windows 2.x or later, there is also a system-level config file at
+`C:\Documents and Settings\All Users\Application Data\Git\config` on Windows XP, and in `C:\ProgramData\Git\config` on Windows Vista and newer.
+This config file can only be changed by `git config -f <file>` as an admin.
 
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