xstrtol-error: Improve comments

[Bruno Haible]

The description of the function xstrtol_fatal mentions parameters ERR,
LONG_OPTION, OPT_IDX, etc. But the function's declaration lacks the
parameter names. So, in order to understand a comment in the .h file,
one needs to look into the declaration in the .c file. Weird!

This patch fixes it.


2023-01-11  Bruno Haible  <bruno@clisp.org>

        xstrtol-error: Improve comments.
        * lib/xstrtol-error.h (xstrtol_fatal): Add parameter names to
        declaration.

diff --git a/lib/xstrtol-error.h b/lib/xstrtol-error.h
index e79ff151ee..d8892ea871 100644
--- a/lib/xstrtol-error.h
+++ b/lib/xstrtol-error.h
@@ -28,7 +28,7 @@
    ERR is the error code returned by one of the xstrto* functions.
 
    Use OPT_IDX to decide whether to print the short option string "C"
-   or "-C" or a long option string derived from LONG_OPTION.  OPT_IDX
+   or "-C" or a long option string derived from LONG_OPTIONS.  OPT_IDX
    is -2 if the short option "C" was used, without any leading "-"; it
    is -1 if the short option "-C" was used; otherwise it is an index
    into LONG_OPTIONS, which should have a name preceded by two '-'
@@ -38,8 +38,9 @@
 
    After reporting an error, exit with a failure status.  */
 
-_Noreturn void xstrtol_fatal (enum strtol_error,
-                              int, char, struct option const *,
-                              char const *);
+_Noreturn void xstrtol_fatal (enum strtol_error /* err */,
+                              int /* opt_idx */, char /* c */,
+                              struct option const * /* long_options */,
+                              char const * /* arg */);
 
 #endif /* not XSTRTOL_ERROR_H_ */