[gnome-builder] doc: default to --user for flatpak installation docs

[Christian Hergert <chergert src gnome org>]

commit b9c52d9a1c33b89762aa389ec4b67a2e9d7cc61c
Author: Christian Hergert <chergert redhat com>
Date:   Fri Feb 24 18:11:04 2017 -0800

    doc: default to --user for flatpak installation docs

 doc/installation.rst |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/doc/installation.rst b/doc/installation.rst
index 18fec86..04a6c02 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -36,14 +36,14 @@ You can also use the command line to install Builder.
 
 .. code-block:: sh
 
-   $ flatpak install --from 
https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref?h=gnome-3-22
+   $ flatpak install --user --from 
https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref?h=gnome-3-22
    $ flatpak run org.gnome.Builder
 
 **Nightly**
 
 .. code-block:: sh
 
-   $ flatpak install --from https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref
+   $ flatpak install --user --from 
https://git.gnome.org/browse/gnome-apps-nightly/plain/gnome-builder.flatpakref
    $ flatpak run org.gnome.Builder
 
 .. note:: Nightly builds are built with tracing enabled. The tracing is fairly lightweight, but it includes 
a great deal of more debugging information.