The behavior of 'rustup override' is not very well known. This patch isReviewed-by: Martin Rodriguez Reboredo <yakoyoku@xxxxxxxxx>
a small edit that adds details about what it does, so users have a better
understanding of how it affects their system toolchain (i.e., it does
not affect system toolchain and only sets a directory-specific
override).
Signed-off-by: Trevor Gross <tmgross@xxxxxxxxx>
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