Added documentation page

Refs #11414

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

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+.. algorithm::
+
+.. summary::
+
+.. alias::
+
+.. properties::
+
+Description
+-----------
+
+This algorithm provides a way of adding multiple sample log enteries to a
+workspace at once by making multiple calls to the :ref:`algm-AddSampleLog`
+algorithm.
+
+Typically this is for use in workflow algorithms and scripts.
+
+Usage
+-----
+
+**Example - Add multiple sample logs**
+
+.. testcode:: AddSampleLogMultipleExample
+
+   # Create a host workspace
+   demo_ws = CreateWorkspace(DataX=range(0,3), DataY=(0,2))
+
+   # Add sample logs
+   log_names = ['x', 'y', 'z']
+   log_values = ['test', 5, 1.6e-7]
+   AddSampleLogMultiple(Workspace=demo_ws,
+                        LogNames=log_names,
+                        LogValues=log_values)
+
+   # Print the log values
+   run = demo_ws.getRun()
+   print run.getLogData('x').value
+   print run.getLogData('y').value
+   print run.getLogData('z').value
+
+Output:
+
+.. testoutput:: AddSampleLogMultipleExample
+
+    test
+    5
+    1.6e-07
+
+.. categories::