doc: fix heading level

Author: phip1611

uefi/src/lib.rs

@@ -13,7 +13,7 @@
 //! epochs. However, the `uefi` crate unfolds its true potential when
 //! interacting with UEFI boot services.
 //!
-//! ## Supported Architectures
+//! # Supported Architectures
 //!
 //! `uefi` is compatible with all platforms that both the Rust compiler and
 //! UEFI support, such as `i686`, `x86_64`, and `aarch64`. Please note that we