Document new options

Refs #11561

Code/Mantid/docs/source/interfaces/Indirect_DataAnalysis.rst

@@ -230,10 +230,25 @@ Plot Guess
   When checked a curve will be created on the plot window based on the bitting
   parameters.
 
+Max Iterations
+  The maximum number of iterations that can be carried out by the fitting
+  algorithm (automatically increased when FABADA is enabled).
+
 StartX & EndX
   The range of :math:`x` over which the fitting will be applied (blue lines on
   preview plot).
 
+Use FABADA
+  Select to enable use of the :ref:`FABADA` minimizer when performing the fit.
+
+Output Chain
+  Select to enable output of the FABADA chain when using FABADA as the fitting
+  minimizer.
+
+Chain Length
+  Number of further steps carried out by fitting algorithm once parameters have
+  converged (see :ref:`FABADA` documentation)
+
 Linear Background A0
   The constant amplitude of the background (horizontal green line on the preview
   plot).
@@ -350,10 +365,25 @@ Plot Guess
   When checked a curve will be created on the plot window based on the bitting
   parameters.
 
+Max Iterations
+  The maximum number of iterations that can be carried out by the fitting
+  algorithm (automatically increased when FABADA is enabled).
+
 StartX & EndX
   The range of :math:`x` over which the fitting will be applied (blue lines on
   preview plot).
 
+Use FABADA
+  Select to enable use of the :ref:`FABADA` minimizer when performing the fit.
+
+Output Chain
+  Select to enable output of the FABADA chain when using FABADA as the fitting
+  minimizer.
+
+Chain Length
+  Number of further steps carried out by fitting algorithm once parameters have
+  converged (see :ref:`FABADA` documentation)
+
 A0 & A1 (background)
   The A0 and A1 parameters as they appear in the LinearBackground fir function,
   depending on the Fit Type selected A1 may not be shown.