[RFC PATCH] docs/system: add a gentle prompt for the complexity to come

["Alex Bennée" <alex.bennee@linaro.org>]

We all know the QEMU command line can become a fiendishly complex
beast. Lets gently prepare our user for the horrors to come by
referencing where other example command lines can be found in the
manual.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 docs/system/quickstart.rst | 8 ++++++++
 docs/system/targets.rst    | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/docs/system/quickstart.rst b/docs/system/quickstart.rst
index 3a3acab5e7..3498c5a29f 100644
--- a/docs/system/quickstart.rst
+++ b/docs/system/quickstart.rst
@@ -11,3 +11,11 @@ Download and uncompress a PC hard disk image with Linux installed (e.g.
    |qemu_system| linux.img
 
 Linux should boot and give you a prompt.
+
+Users should be aware the above example elides a lot of the complexity
+of setting up a VM with x86_64 specific defaults and an assumption the
+first non switch argument is a PC compatible disk image with a boot
+sector. For non-x86 system where we emulate a broad range of machine
+types the command lines are generally more explicit in defining the
+machine and boot behaviour. You will find more example command lines
+in the :ref:`system-targets-ref` section of the manual.
diff --git a/docs/system/targets.rst b/docs/system/targets.rst
index 560783644d..145cc64551 100644
--- a/docs/system/targets.rst
+++ b/docs/system/targets.rst
@@ -1,3 +1,5 @@
+.. _system-targets-ref:
+
 QEMU System Emulator Targets
 ============================
 
-- 
2.20.1