Remove stale TODO section references

tests/test_convert.c

@@ -3,7 +3,7 @@
  *
  * Numeric conversion, complete. The cases that used to live in
  * tests/test_convert_strict.c -- registered as a known failure because the ato*
- * family had no error channel at all (2.1.5) -- are folded back in here now that
+ * family had no error channel at all -- are folded back in here now that
  * they pass: non-numeric input, empty input, trailing junk and overflow are all
  * errors rather than silent wrong answers.
  *
@@ -54,7 +54,7 @@ static int test_atoi_rejects_null_arguments(void)
 }
 
 /*
- * The whole reason 2.1.5 mattered. atoi("not a number") returned success and 0,
+ * The whole reason strict conversion matters. atoi("not a number") returned success and 0,
  * so a caller could not tell a parse failure from a legitimate zero -- and
  * akbasic had to write ~60 lines of its own strtoll/strtod wrapper to avoid
  * turning four diagnosable BASIC errors into four wrong answers.