Refs #14121. Fixing documentation

docs/source/algorithms/PawleyFit-v1.rst

@@ -51,7 +51,7 @@ For the usage example there is a calculated, theoretical diffraction pattern (in
 
     # Run the actual fit with lattice parameters that are slightly off
     si_fitted, si_cell, si_params, chi_square = PawleyFit(si_spectrum,
-                          CrystalSystem='Cubic',
+                          LatticeSystem='Cubic',
                           InitialCell='5.436 5.436 5.436',
                           PeakTable=si_peaks_indexed)
 

docs/source/fitfunctions/LatticeFunction.rst

@@ -14,7 +14,7 @@ been used to assign indices. LatticeFunction can be used to achieve that task wi
 work with a PeaksWorkspace or with a TableWorkspace that contains two columns named `HKL` and `d` (see
 :ref:`algm-PawleyFit` for specification of the table).
 
-After setting the `CrystalSystem` attribute to one of the seven crystal systems, the function exposes the
+After setting the `LatticeSystem` attribute to one of the seven lattice systems, the function exposes the
 corresponding lattice parameters, as well as a `ZeroShift`. In most cases it's recommended to fix this additional
 parameter as this is often taken care of in earlier steps of the data reduction.
 
@@ -38,7 +38,7 @@ used to generate Bragg reflections that are expected for the crystal structure o
                 LatticeSpacingMin=0.7)
 
     # Fit a cubic cell, starting parameter is 5
-    Fit(Function="name=LatticeFunction,CrystalSystem=Cubic,a=5",
+    Fit(Function="name=LatticeFunction,LatticeSystem=Cubic,a=5",
         InputWorkspace=peaks_Si,
         Ties="ZeroShift=0.0",
         CreateOutput=True,

docs/source/fitfunctions/PawleyFunction.rst

@@ -11,7 +11,7 @@ Description
 
 The basic principle of fitting unit cell parameters to a complete powder diffraction pattern has been described by Pawley. Instead allowing each peak to have a freely selectable position, these positions are calculated as a result from the unit cell parameters. All other parameters of the peaks are refined independently. The implementation of the function differs from the method described in the paper in some points, for example the number of parameters can not change during the refinement (no reflections will be added or removed).
 
-Since the function requires special setup (assignment of HKLs, selection of crystal system and profile function), there is an algorithm that can perform a Pawley-type fit with different input data. Please see the documentation of :ref:`algm-PawleyFit` for details on how to use it.
+Since the function requires special setup (assignment of HKLs, selection of lattice system and profile function), there is an algorithm that can perform a Pawley-type fit with different input data. Please see the documentation of :ref:`algm-PawleyFit` for details on how to use it.
 
 .. attributes::