[PATCH] Fix README formatting

[Florian Weimer]

* Krystian Kuźniarek via Libc-alpha:

> Assuming README is a Markdown file, I think there is a typo that changes
> the meaning of code section as the closing ` character was probably
> mistaken with '.

These are Texinfo quotes (which are derived from TeX's), and they are
used in other places in glibc (and other GNU software).

Thanks,
Florian
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