Doc: move info about Linux targets to doc/src/linux-mobile folder

Change-Id: Id9cccd999698e89c8b372f398e5e2755172ca644
Reviewed-on: http://codereview.qt-project.org/5604
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>

doc/src/linux-mobile/linuxdev-keys.qdocinc

@@ -0,0 +1,25 @@
+    \section2 Generating SSH Keys
+
+    If you do not have an SSH public and private key pair, you can generate it
+    in \QC. You can specify key length and the key algorithm, RSA or DSA.
+    If you only use the keys to protect connections to the emulator or
+    device, you can use the default values.
+
+    \list 1
+
+        \o  Select \gui {Tools > Options > Linux Devices > Device
+            Configurations > Generate SSH Key}.
+
+        \o  Click \gui {Generate SSH Key}.
+
+            \image qtcreator-ssh-key-configuration.png "SSH Key Configuration dialog"
+
+        \o  Click \gui {Save Public Key} to select the location to save the
+            public key.
+
+        \o  Click \gui {Save Private Key} to specify the location to save the
+            private key.
+
+        \o  Click \gui Close to close the dialog.
+
+    \endlist