Update node.md

Author: ed-flanagan

docs/tutorials/basic/node.md

@@ -21,7 +21,7 @@ that the example in this tutorial uses the
 buffers language. You can find out more in the
 [proto3 language guide](https://developers.google.com/protocol-buffers/docs/proto3)
 and see the [release notes](https://github.com/google/protobuf/releases) for
-the new version in the protocol buffers Github repository.
+the new version in the protocol buffers GitHub repository.
 
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