Added deploy script details to instrument scripts page

doc/scripting/instrument-scripts.md

@@ -1,3 +1,12 @@
 # Shared Instrument Scripts
 
-The general instrument scripts are in this [repository](https://github.com/ISISNeutronMuon/InstrumentScripts) and include scripts like `do_sans` and `do_trans`, as well as the (old) scans library.
+The general instrument scripts are in this [repository](https://github.com/ISISNeutronMuon/InstrumentScripts) and include scripts like `do_sans` and `do_trans`, as well as the (old) scans library.
+
+During IBEX deployment, an optional step has been added to the deploy script (see [ticket](https://github.com/ISISComputingGroup/IBEX/issues/7914)
+for details) to pull the latest master branch of the scripts repository and attempt an automatic merge with the local branch.
+This step will immediately fail if the local branch is _not_ named after the machine (e.g. _NDXxxx_) it is being run on.
+Following a successful check of the branch name, an automatic merge is attempted and should this fail, 
+a set of instructions is presented to the user to perform a _manual_ merge.  No further action is taken by this deployment task.
+
+At the time of writing, there is **no** automated task for this 'pull and merge' of the instrument scripts 
+(i.e. is it not present in the CI system), it is **only** performed as an optional step during IBEX deployment.