bug#18184: [patch] doc: marking some environment variables as such

[Benno Schulenberg]

Hi,

In doc/grep.texi some environment variables are marked with
@code{} instead of @env{}.  Attached patch fixes this.

There are some other env vars that still use @code{}, but
they refer to a "category" -- I don't quite know whether
these should be marked differently too, so I have left
them alone.

Benno

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0001-doc-mark-up-some-environment-variables-as-such.patch
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