rust: std_vendor: update dbg macro from Rust upstream

`dbg!` contains adapted code from Rust upstream. Compare the kernel
code with the Rust upstream one and update missing column numbers in
`dbg!` outputs.

Column numbers are not copied but adjusted for the kernel's examples.

Suggested-by: Miguel Ojeda <ojeda@kernel.org>
Link: #1124
Signed-off-by: Deepak Thukral <iapain@gmail.com>
Link: https://lore.kernel.org/r/20241004125616.49886-1-iapain@gmail.com
[ Fixed typo and slightly reworded. - Miguel ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Author: iapain

rust/kernel/std_vendor.rs

@@ -18,7 +18,7 @@
 /// let a = 2;
 /// # #[expect(clippy::disallowed_macros)]
 /// let b = dbg!(a * 2) + 1;
-/// //      ^-- prints: [src/main.rs:2] a * 2 = 4
+/// //      ^-- prints: [src/main.rs:3:9] a * 2 = 4
 /// assert_eq!(b, 5);
 /// ```
 ///
@@ -67,7 +67,7 @@
 /// This prints to the kernel log:
 ///
 /// ```text,ignore
-/// [src/main.rs:4] n.checked_sub(4) = None
+/// [src/main.rs:3:8] n.checked_sub(4) = None
 /// ```
 ///
 /// Naive factorial implementation:
@@ -88,15 +88,15 @@
 /// This prints to the kernel log:
 ///
 /// ```text,ignore
-/// [src/main.rs:3] n <= 1 = false
-/// [src/main.rs:3] n <= 1 = false
-/// [src/main.rs:3] n <= 1 = false
-/// [src/main.rs:3] n <= 1 = true
-/// [src/main.rs:4] 1 = 1
-/// [src/main.rs:5] n * factorial(n - 1) = 2
-/// [src/main.rs:5] n * factorial(n - 1) = 6
-/// [src/main.rs:5] n * factorial(n - 1) = 24
-/// [src/main.rs:11] factorial(4) = 24
+/// [src/main.rs:3:8] n <= 1 = false
+/// [src/main.rs:3:8] n <= 1 = false
+/// [src/main.rs:3:8] n <= 1 = false
+/// [src/main.rs:3:8] n <= 1 = true
+/// [src/main.rs:4:9] 1 = 1
+/// [src/main.rs:5:9] n * factorial(n - 1) = 2
+/// [src/main.rs:5:9] n * factorial(n - 1) = 6
+/// [src/main.rs:5:9] n * factorial(n - 1) = 24
+/// [src/main.rs:11:1] factorial(4) = 24
 /// ```
 ///
 /// The `dbg!(..)` macro moves the input: