Fix typo in safety comments

Author: NobodyXu

src/mem.rs

@@ -362,7 +362,7 @@ impl Compress {
         output: &mut Vec<u8>,
         flush: FlushCompress,
     ) -> Result<Status, CompressError> {
-        // SAFETY: bytes_written is the number of bytes writte into `out`
+        // SAFETY: bytes_written is the number of bytes written into `out`
         unsafe {
             write_to_spare_capacity_of_vec(output, |out| {
                 let before = self.total_out();
@@ -499,7 +499,7 @@ impl Decompress {
         output: &mut Vec<u8>,
         flush: FlushDecompress,
     ) -> Result<Status, DecompressError> {
-        // SAFETY: bytes_written is the number of bytes writte into `out`
+        // SAFETY: bytes_written is the number of bytes written into `out`
         unsafe {
             write_to_spare_capacity_of_vec(output, |out| {
                 let before = self.total_out();