Clarify tsBuildInfoFile isn't a folder #2303
Merged
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I copied the description from the 1.0 config reference, roughly: https://web.archive.org/web/20200606234156/https://www.typescriptlang.org/docs/handbook/compiler-options.html#:~:text=specify%20what%20file%20to%20store%20incremental%20build%20information%20in.
I also elaborated slightly on the default value, based on the implementation in getTsBuildInfoEmitOutputFilePath(): https://github.com/microsoft/TypeScript/blob/918f0ef4040b372df357c5439601576baaeeec4c/src/compiler/emitter.ts#L53
Thanks @uhyo for reporting the issue and @Blopaa and @Uda-Titor for corrections to the compiler repo.