lint: follow convention no capitcal letter in first word

Author: weihanglo

clippy.toml

@@ -1,8 +1,8 @@
 allow-print-in-tests = true
 allow-dbg-in-tests = true
 disallowed-methods = [
-    { path = "std::env::var", reason = "Use `Config::get_env` instead. See rust-lang/cargo#11588" },
-    { path = "std::env::var_os", reason = "Use `Config::get_env_os` instead. See rust-lang/cargo#11588" },
-    { path = "std::env::vars", reason = "Not recommended to use in Cargo. See rust-lang/cargo#11588" },
-    { path = "std::env::vars_os", reason = "Not recommended to use in Cargo. See rust-lang/cargo#11588" },
+    { path = "std::env::var", reason = "use `Config::get_env` instead. See rust-lang/cargo#11588" },
+    { path = "std::env::var_os", reason = "use `Config::get_env_os` instead. See rust-lang/cargo#11588" },
+    { path = "std::env::vars", reason = "not recommended to use in Cargo. See rust-lang/cargo#11588" },
+    { path = "std::env::vars_os", reason = "not recommended to use in Cargo. See rust-lang/cargo#11588" },
 ]