Typo in objective-c example README

[Pchatain]

There is no build_xcframework.sh file, it should be build-xcframework.sh

In https://github.com/ggerganov/whisper.cpp/tree/master/examples/whisper.objc

This example uses the whisper.xcframework which needs to be built first using the following command:

./build_xcframework.sh

should instead be

This example uses the whisper.xcframework which needs to be built first using the following command:

./build-xcframework.sh