[PATCH V2] docs: rust: Clarify that 'rustup override' applies to build directory

[Viresh Kumar]

Rustup override is required to be set for the build directory and not
necessarily the kernel source tree (unless the build directory is its
subdir).

Clarify the same in quick-start guide.

Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
V2:
- Made few changes based on review comments.

 Documentation/rust/quick-start.rst | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/Documentation/rust/quick-start.rst b/Documentation/rust/quick-start.rst
index f382914f4191..7ea931f74e09 100644
--- a/Documentation/rust/quick-start.rst
+++ b/Documentation/rust/quick-start.rst
@@ -33,14 +33,18 @@ A particular version of the Rust compiler is required. Newer versions may or
 may not work because, for the moment, the kernel depends on some unstable
 Rust features.
 
-If ``rustup`` is being used, enter the checked out source code directory
-and run::
+If ``rustup`` is being used, enter the kernel build directory (or use
+`--path=<build-dir>` argument to the `set` sub-command) and run::
 
 	rustup override set $(scripts/min-tool-version.sh rustc)
 
 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:
+``rustc`` without affecting your default toolchain.
+
+Note that the override applies to the current working directory (and its
+sub-directories).
+
+If you are not using ``rustup``, fetch a standalone installer from:
 
 	https://forge.rust-lang.org/infra/other-installation-methods.html#standalone
 
-- 
2.31.1.272.g89b43f80a514