NFC: Fix doc comment typo in productpipeline_list_builder.py (#82771)

`Product a final schedule` -> `Produce a final schedule`

Author: MaxDesiatov

utils/swift_build_support/swift_build_support/productpipeline_list_builder.py

@@ -2,7 +2,7 @@
 #
 # This source file is part of the Swift.org open source project
 #
-# Copyright (c) 2014 - 2021 Apple Inc. and the Swift project authors
+# Copyright (c) 2014 - 2025 Apple Inc. and the Swift project authors
 # Licensed under Apache License v2.0 with Runtime Library Exception
 #
 # See https:#swift.org/LICENSE.txt for license information
@@ -182,7 +182,7 @@ def infer(self):
         return (filtered_results, last_impl_pipeline_index)
 
     def finalize(self, shouldInfer):
-        """Product a final schedule and return a list of our product pipelines. Resets
+        """Produce a final schedule and return a list of our product pipelines. Resets
            the builder when done so is a consuming operation.
         """
         # Append the current pipeline if we have one.