scripts: rust: mention file name in error messages

Improve two error messages in the script by mentioning the doctest file
path from which the doctest was generated from.

This will allow, in case the conversion fails, to get directly the file
name triggering the issue, making the bug fixing process faster.

Signed-off-by: Guillaume Gomez <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[ Reworded and removed an unneeded added parameter comma. - Miguel ]
Signed-off-by: Miguel Ojeda <[email protected]>

Author: GuillaumeGomez

scripts/rustdoc_test_gen.rs

@@ -87,8 +87,8 @@ fn find_real_path<'a>(srctree: &Path, valid_paths: &'a mut Vec<PathBuf>, file: &
 
     assert!(
         valid_paths.len() > 0,
-        "No path candidates found. This is likely a bug in the build system, or some files went \
-        away while compiling."
+        "No path candidates found for `{file}`. This is likely a bug in the build system, or some \
+        files went away while compiling."
     );
 
     if valid_paths.len() > 1 {
@@ -97,8 +97,8 @@ fn find_real_path<'a>(srctree: &Path, valid_paths: &'a mut Vec<PathBuf>, file: &
             eprintln!("    {path:?}");
         }
         panic!(
-            "Several path candidates found, please resolve the ambiguity by renaming a file or \
-            folder."
+            "Several path candidates found for `{file}`, please resolve the ambiguity by renaming \
+            a file or folder."
         );
     }