Add SaveParametersFile python usage example.

Refs #10023

Code/Mantid/docs/source/algorithms/SaveParameterFile-v1.rst

@@ -17,3 +17,40 @@ Mantid using the `LoadParameterFile <http://mantidproject.org/LoadParameterFile>
 The LocationParameters property specifies whether or not to save any calibration parameters
 used to adjust the location of any components. Specifically, it will skip "x", "y", "z",
 "r-position", "t-position", "p-position", "rotx", "roty", and "rotz" parameters.
+
+Usage
+-----
+
+**Example - save an instrument's parameters to a file:**
+
+.. testcode:: ExParametersSimple
+
+  Load(Filename="MAR11001.raw", OutputWorkspace="MAR11001", LoadMonitors="Separate")
+  SaveParameterFile(Workspace="MAR11001", Filename="/tmp/params.xml", LocationParameters=False)
+
+  pfile = open("/tmp/params.xml", "r")
+  lines = pfile.readlines()
+  pfile.close()
+
+  for line in lines[0:6]:
+    print(line.strip())
+  print("etc...")
+
+.. testcleanup:: ExParametersSimple
+
+   import os
+   os.remove("/tmp/params.xml")
+
+Output:
+
+.. testoutput:: ExParametersSimple
+
+  <?xml version="1.0" encoding="UTF-8"?>
+  <parameter-file instrument="MARI" valid-from="1900-01-31T23:59:59">
+  <component-link name="MARI">
+  <parameter name="DelayTime">
+  <value val="-3.9"/>
+  </parameter>
+  etc...
+
+.. categories::