fix link

Author: avehtari

src/cmdstan-guide/stan_csv_apdx.qmd

@@ -16,7 +16,7 @@ the strings `NaN`, `inf`, `+inf`, `-inf`.
 All other values are written in decimal notation by default with
 at most 6 digits of precision. The number of significant digits 
 written can be controlled with argument `sig_figs=<int>`. See more 
-in [Output control arguments section](command_line_options.qmd).
+in [Output control arguments section](command_line_options.qmd#output-control.section).
 
 Stan CSV files have a header row containing the column names.
 They also make extensive use of CSV comments,