Doc - Add information about using msysGit on Windows.

Reviewed-by: Friedemann Kleint

doc/qtcreator.qdoc

@@ -843,6 +843,8 @@
            resolution, select \gui{Embedded Design}.
     \endlist
 
+    To switch between forms and code, use \key Shift+F4.
+
     For more information on \QD, see
     \l{http://doc.qt.nokia.com/4.7-snapshot/designer-manual.html}{Qt Designer Manual}.
 
@@ -3916,6 +3918,22 @@
     that everything works (for example, use the status command). If no issues arise,
     you should be ready to use the system also from Qt Creator.
 
+    \section2 Using msysGit on Windows
+
+    If you configure Git for use with \c {git bash}, only, and use SSH
+    authorization, Git looks for the SSH keys in the directory where the
+    \c HOME environment points to. The variable is always set by \c {git bash}.
+
+    However, the variable is typically not set in a Windows command prompt.
+    When you run Git from a Windows command prompt, it looks for the SSH keys in its
+    installation directory, and therefore, the authorization fails.
+
+    You can set the \c HOME environment variable from Qt Creator. Select \gui {Tools >
+    Options... > Version Control > Git}. Select the \gui {Environment Variables}
+    and the \gui {Set "HOME" environment variable} check boxes. \c HOME is set to
+    \c %HOMEDRIVE%%HOMEPATH% when the Git executable is run and authorization works
+    as it would with \c {git bash}.
+
     \section1 Setting Up Common Options
 
     Select \gui{Tools} > \gui{Options...} > \gui{Version Control} > \gui{Common}