Fix description of k-nearest output layer

The output layer may have multiple features  - rewording to be more general.

Author: rudivs

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

@@ -90,7 +90,7 @@ def initAlgorithm(self, config=None):
         self.addParameter(QgsProcessingParameterField(self.FIELD,
                                               self.tr('Field (optional, set if creating concave hulls by class)'),
                                               parentLayerParameterName=self.INPUT, optional=True))
-        self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Bounding geometry'),
+        self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Output layer'),
                                                             QgsProcessing.TypeVectorPolygon))
 
     def processAlgorithm(self, parameters, context, feedback):