Group typo fixes #2 (#5561)

Co-authored-by: Arr00 <13561405+arr00@users.noreply.github.com>
Co-authored-by: ernestognw <ernestognw@gmail.com>

scripts/generate/templates/TransientSlot.js

@@ -34,7 +34,7 @@ pragma solidity ^0.8.24;
 
 const udvt = ({ type, name }) => `\
 /**
- * @dev UDVT that represents a slot holding a ${type}.
+ * @dev UDVT that represents a slot holding ${type == 'address' ? 'an' : 'a'} ${type}.
  */
 type ${name}Slot is bytes32;