Rollup merge of #59666 - DevQps:update-rustc-environment-descriptions, r=GuillaumeGomez

Updated the environment description in rustc.

# Description

- Updated the "environment" description in the `rustc` man pages

The old wording suggested that all the mentioned flags influenced the output of the compiler,
where this was not the case.

closes #59504
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Mazdak Farrokhzad 2019-04-04 01:49:11 +02:00 committed by GitHub
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@ -265,8 +265,8 @@ Optimize with possible levels 0\[en]3
.SH ENVIRONMENT
Some of these affect the output of the compiler, while others affect programs
which link to the standard library.
Some of these affect only test harness programs (generated via rustc --test);
others affect all programs which link to the Rust standard library.
.TP
\fBRUST_TEST_THREADS\fR