Update src/shims/unix/fd.rs

Co-authored-by: Ralf Jung <post@ralfj.de>

Author: tiif

src/shims/unix/fd.rs

@@ -660,7 +660,7 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 // Crucially, if fewer than `bytes.len()` bytes were read, only write
                 // that much into the output buffer!
                 this.write_bytes_ptr(buf, bytes[..read_bytes].iter().copied())?;
-                // The actual read size is always lesser than `count` so this cannot fail.
+                // The actual read size is always less than what got originally requested so this cannot fail.
                 this.write_int(u64::try_from(read_bytes).unwrap(), dest)?;
                 return Ok(());
             }