[processing] fix typo in the algorithm name (fix #12227)

Author: alexbruy

python/plugins/processing/algs/qgis/QGISAlgorithmProvider.py

@@ -39,7 +39,7 @@
 from processing.script.ScriptUtils import ScriptUtils
 
 from RegularPoints import RegularPoints
-from SymetricalDifference import SymetricalDifference
+from SymmetricalDifference import SymmetricalDifference
 from VectorSplit import VectorSplit
 from VectorGrid import VectorGrid
 from RandomExtract import RandomExtract
@@ -152,7 +152,7 @@ def __init__(self):
                         RandomSelection(), RandomSelectionWithinSubsets(),
                         SelectByLocation(), RandomExtract(),
                         RandomExtractWithinSubsets(), ExtractByLocation(),
-                        SpatialJoin(), RegularPoints(), SymetricalDifference(),
+                        SpatialJoin(), RegularPoints(), SymmetricalDifference(),
                         VectorSplit(), VectorGrid(), DeleteColumn(),
                         DeleteDuplicateGeometries(), TextToFloat(),
                         ExtractByAttribute(), SelectByAttribute(), Grid(),

python/plugins/processing/algs/qgis/SymetricalDifference.py renamed to python/plugins/processing/algs/qgis/SymmetricalDifference.py

@@ -33,14 +33,14 @@
 from processing.tools import dataobjects, vector
 
 
-class SymetricalDifference(GeoAlgorithm):
+class SymmetricalDifference(GeoAlgorithm):
 
     INPUT = 'INPUT'
     OVERLAY = 'OVERLAY'
     OUTPUT = 'OUTPUT'
 
     def defineCharacteristics(self):
-        self.name = 'Symetrical difference'
+        self.name = 'Symmetrical difference'
         self.group = 'Vector overlay tools'
         self.addParameter(ParameterVector(self.INPUT,
             self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_ANY]))