[FAB-4151] Fix docker prereqs

Fix the pre-req mention
remove the specific docker version from BYFN and point to
pre-req page
Also should address FAB-5216
[ci-skip]

Change-Id: Ic804229ae601b585bebdd4a49ca070458e7807b8
Signed-off-by: Mark Parzygnat <markparz@us.ibm.com>

docs/source/build_network.rst

@@ -930,7 +930,7 @@ Troubleshooting
 
 - **YOU WILL SEE ERRORS IF YOU DO NOT REMOVE CONTAINERS AND IMAGES**
 
--  If you see Docker errors, first check your version (should be 17.03.1 or above),
+-  If you see Docker errors, first check your docker version (:doc:`prereqs`),
    and then try restarting your Docker process.  Problems with Docker are
    oftentimes not immediately recognizable.  For example, you may see errors
    resulting from an inability to access crypto material mounted within a

docs/source/prereqs.rst

@@ -17,10 +17,10 @@ You will need the following installed on the platform on which you will be
 operating, or developing on (or for), Hyperledger Fabric:
 
   - MacOSX, *nix, or Windows 10: `Docker <https://www.docker.com/products/overview>`__
-    Docker version 17.03.0-ce or greater is required.
+    Docker version 17.03.1-ce or greater is required.
   - Older versions of Windows: `Docker
     Toolbox <https://docs.docker.com/toolbox/toolbox_install_windows/>`__ -
-    again, Docker version Docker 17.03.0-ce or greater is required.
+    again, Docker version Docker 17.03.1-ce or greater is required.
 
 You can check the version of Docker you have installed with the following
 command from a terminal prompt: