Add safety docs (#7665)

sdk/bpf/rust/test/src/lib.rs

@@ -1,6 +1,7 @@
 //! @brief Solana Rust-based BPF program utility functions and types
 
 #[no_mangle]
+/// # Safety
 pub unsafe fn sol_log_(message: *const u8, length: u64) {
     let slice = std::slice::from_raw_parts(message, length as usize);
     let string = std::str::from_utf8(&slice).unwrap();

sdk/src/entrypoint.rs

@@ -27,6 +27,7 @@ pub const SUCCESS: u32 = 0;
 #[macro_export]
 macro_rules! entrypoint {
     ($process_instruction:ident) => {
+        /// # Safety
         #[no_mangle]
         pub unsafe extern "C" fn entrypoint(input: *mut u8) -> u32 {
             unsafe {