Update 033_iferror.zig

exercises/033_iferror.zig

@@ -1,6 +1,6 @@
 //
 // Let's revisit the very first error exercise. This time, we're going to
-// look at a special error-handling type of the "if" statement.
+// look at an error-handling variation of the "if" statement.
 //
 //     if (foo) |value| {
 //