Update Contributors and Typo Correction (#1658)

Author: yt0705

CONTRIBUTING.md

@@ -1,4 +1,6 @@
 # Contributing Guide
+> [!CAUTION]
+> **Sorry, pull requests from external contributors are currently closed**
 
 ## Issue Tracker
 

tests/keras_tests/feature_networks_tests/feature_networks/network_editor/change_qc_attr_test.py

@@ -46,7 +46,7 @@ def create_networks(self):
     def compare(self, quantized_model, float_model, input_x=None, quantization_info=None):
         conv_layer = get_layers_from_model_by_type(quantized_model, layers.Conv2D)[0]
         self.unit_test.assertTrue(conv_layer.layer.bias is None)  # If bias correction is enabled, a bias should be added -
-        # This asserts the editing occured
+        # This asserts the editing occurred
 
 
 class ChangeFinalActivationQCAttrTest(BaseKerasFeatureNetworkTest):