Fix warning message

Author: Shankar Mathiah Nanjundan

src/cargo/ops/cargo_new.rs

@@ -261,8 +261,7 @@ fn check_name(
     let name_in_lowercase = name.to_lowercase();
     if name != name_in_lowercase {
         shell.warn(format!(
-            "package `{}` should have a lowercase name such as `{}`",
-            name, name_in_lowercase
+            "the name `{name}` is not snake_case or kebab-case which is recommended for package names, consider `{name_in_lowercase}`"
         ))?;
     }
 

tests/testsuite/new.rs

@@ -451,7 +451,7 @@ fn non_ascii_name() {
             "\
 [WARNING] the name `Привет` contains non-ASCII characters
 Non-ASCII crate names are not supported by Rust.
-[WARNING] package `Привет` should have a lowercase name such as `привет`
+[WARNING] the name `Привет` is not snake_case or kebab-case which is recommended for package names, consider `привет`
 [CREATED] binary (application) `Привет` package
 ",
         )
@@ -507,7 +507,7 @@ fn non_snake_case_name() {
     cargo_process("new UPPERcase_name")
         .with_stderr(
             "\
-[WARNING] package `UPPERcase_name` should have a lowercase name such as `uppercase_name`
+[WARNING] the name `UPPERcase_name` is not snake_case or kebab-case which is recommended for package names, consider `uppercase_name`
 [CREATED] binary (application) `UPPERcase_name` package
 ",
         )