[PATCH v2 2/2] docs: rust: clarify what 'rustup override' does

[Trevor Gross]

The behavior of 'rustup override' is not very well known. Add a small
note 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>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@xxxxxxxxx>
Reviewed-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
---
 Documentation/rust/quick-start.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/rust/quick-start.rst b/Documentation/rust/quick-start.rst
index 632b115dd20d..0612ea517bc1 100644
--- a/Documentation/rust/quick-start.rst
+++ b/Documentation/rust/quick-start.rst
@@ -38,7 +38,9 @@ and run::
 
 	rustup override set $(scripts/min-tool-version.sh rustc)
 
-Otherwise, fetch a standalone installer from:
+This will configure your working directory to use the correct version of
+``rustc`` without affecting your default toolchain. If you are not using
+``rustup``, fetch a standalone installer from::
 
 	https://forge.rust-lang.org/infra/other-installation-methods.html#standalone
 
-- 
2.34.1