perf tools: Add comment explaining the repsep_snprintf function

int		sort__has_thread = 0;

enum sort_mode	sort__mode = SORT_MODE__NORMAL;

/*

 * Replaces all occurrences of a char used with the:

 *

 * -t, --field-separator

 *

 * option, that uses a special separator character and don't pad with spaces,

 * replacing all occurances of this separator in symbol names (and other

 * output) with a '.' character, that thus it's the only non valid separator.

*/

static int repsep_snprintf(char *bf, size_t size, const char *fmt, ...)

{

	int n;