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[ELF] Mention contents of reproduce archive and add help description.

Description

[ELF] Mention contents of reproduce archive and add help description.

Building on D60557 mention the name of the linker generated contents of
the reproduce archive, response.txt and version.txt.

Also write a shorter description in the ld.lld --help that is closer to
the documentation.

Differential Revision: https://reviews.llvm.org/D66641