Add Python annotations and remove args kwargs from Python methods

docs/pyqgis_developer_cookbook/processing.rst

@@ -91,34 +91,38 @@ If you want to add your existing plugin to Processing, you need to add some code
       :skipif: True
 
       from qgis.core import QgsProcessingProvider
+      from qgis.PyQt.QtGui import QIcon
 
       from .example_processing_algorithm import ExampleProcessingAlgorithm
 
 
       class Provider(QgsProcessingProvider):
 
-          def loadAlgorithms(self, *args, **kwargs):
+          """ The provider of our plugin. """
+
+          def loadAlgorithms(self):
+              """ Load each algorithm into the current provider. """
               self.addAlgorithm(ExampleProcessingAlgorithm())
               # add additional algorithms here
               # self.addAlgorithm(MyOtherAlgorithm())
 
-          def id(self, *args, **kwargs):
+          def id(self) -> str:
               """The ID of your plugin, used for identifying the provider.
 
               This string should be a unique, short, character only string,
               eg "qgis" or "gdal". This string should not be localised.
               """
               return 'yourplugin'
 
-          def name(self, *args, **kwargs):
+          def name(self) -> str:
               """The human friendly name of your plugin in Processing.
 
               This string should be as short as possible (e.g. "Lastools", not
               "Lastools version 1.0.1 64-bit") and localised.
               """
               return self.tr('Your plugin')
 
-          def icon(self):
+          def icon(self) -> QIcon:
               """Should return a QIcon which is used for your provider inside
               the Processing toolbox.
               """