Correct comment typo in ParenExpr class

Fix typo in comment regarding ParenExpr deprecation.

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: owen-mc

go/ql/lib/semmle/go/Expr.qll

@@ -555,7 +555,7 @@ class SliceLit extends ArrayOrSliceLit {
  * Note that `ParenExpr` is no longer extracted - the child expression takes
  * the place of the parenthesized expression directly. This class only exists
  * for compatibility with old databases, and will be deprecated and removed in
- * future.
+ * the future.
  */
 class ParenExpr extends @parenexpr, Expr {
   /** Gets the expression between parentheses. */