Documentation: Add RF shield installation instructions to docs (#1074)

* Documentation: Add RF shield installation instructions page.

Add a page with written instructions for installing a RF shield on a HackRF One. Includes pictures of various steps in the process

* Documentation: Add rf_shield_installation.rst that was left out of previous commit.

* Documentation: Move tag in multiple_device_hardware_synch.rst to correct location.

* Documentation: Add edits suggested by straithe to rf_shield instructions

docs/source/multiple_device_hardware_synch.rst

@@ -13,6 +13,8 @@ This page describes the modifications required to get multiple HackRF hardware-l
 
 The HackRFs will start transmitting USB packets at the same time, which results in an inter-device offset of ~50 samples at a sample rate of 20MSps. Without this synchronisation, the offset is in the range of thousands to tens of thousands of samples. This is due to the USB start command being called sequentially for each device, along with USB buffering, OS-level timing etc.
 
+
+
 **BE WARNED** you will have to open your HackRFs, which is most likely going to destroy the plastic case it comes in. You will also be electrically connecting them together. If you do this incorrectly, there is a good chance one or all of the devices will be permanently destroyed.
 
 
@@ -35,6 +37,7 @@ For this to work you will need:
     * a breadboard
 
 
+.. _opening_your_hackrf:
 
 Opening your HackRF
 ~~~~~~~~~~~~~~~~~~~
@@ -141,4 +144,4 @@ Obviously the method of wiring up multiple HackRFs described above is fragile an
 Usually the *Osmocom source* can be used for multi-device streaming, as it can be configured to pull from more than one device. Unfortunately the current version does not have hardware synchronisation built in. Work is being done to make the *Osmocom source* compatible with these changes.
 
 .. image:: ../images/grc-hw-sync-streaming.png
-	:align: center
+	:align: center