Fix wrong crate name in the crate doc of spdlog-internal

Author: SpriteOvO

spdlog-internal/src/lib.rs

@@ -1,6 +1,6 @@
 //! Internal private common code for crate [`spdlog-rs`].
 //!
-//! `spdlog-macros` should never be used as a standalone dependency, use
+//! `spdlog-internal` should never be used as a standalone dependency, use
 //! [`spdlog-rs`] instead.
 //!
 //! [`spdlog-rs`]: https://crates.io/crates/spdlog-rs