rust: impl_flags: use bit helper in example

Use bit_u32() instead of open-coding shifts in the impl_flags! example. This demonstrates the checked bit helper and ensures that bit positions remain within the underlying u32 type.

---
 rust/kernel/impl_flags.rs | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

index e2bd7639d..fdf44d5ee 100644
@@ -19,7 +19,10 @@
 /// # Examples
 ///
 /// ```
-/// use kernel::impl_flags;
+/// use kernel::{
+///     bits::bit_u32,
+///     impl_flags, //
+/// };
 ///
 /// impl_flags!(
 ///     /// Represents multiple permissions.

@@ -30,13 +33,13 @@
 ///     #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 ///     pub enum Permission {
 ///         /// Read permission.
-///         Read = 1 << 0,
+///         Read = bit_u32(0),
 ///
 ///         /// Write permission.
-///         Write = 1 << 1,
+///         Write = bit_u32(1),
 ///
 ///         /// Execute permission.
-///         Execute = 1 << 2,
+///         Execute = bit_u32(2),
 ///     }
 /// );
 ///

base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482

2.54.0

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