More clearly define the default abi of an extern block #2001
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This attempts to make it clearer that if the ABI string is not specified, it defaults to the "C" ABI. I felt like the existing text didn't emphasize that enough.
I also took the opportunity to reword the intro to more generally explain what the ABI string does.
A followup PR will further clarify some of the confusing use of the word "default" in the specific ABI definitions.
This is implemented in
ExternAbi::FALLBACK