Improve error message for missing dependencies

src/cargo/util/toml_mut/manifest.rs

@@ -681,9 +681,13 @@ fn non_existent_dependency_err(
 ) -> anyhow::Error {
     let mut msg = format!("the dependency `{name}` could not be found in `{search_table}`");
     if let Some(found_table) = found_table {
-        msg.push_str(&format!("; it is present in `{found_table}`",));
+        msg.push_str(&format!(
+            "\n\nhelp: a dependency with the same name exists in `{found_table}`"
+        ));
     } else if let Some(alt_name) = alt_name {
-        msg.push_str(&format!("; dependency `{alt_name}` exists",));
+        msg.push_str(&format!(
+            "\n\nhelp: a dependency with a similar name exists: `{alt_name}`"
+        ));
     }
     anyhow::format_err!(msg)
 }