add bisect information and update man page

XD.1

@@ -26,6 +26,7 @@ tab(;) allbox;
 c;l.
  :;default
  \;;in a git repo
+ =;in a git repo during a bisect
  8;in a git repo with stashed changes
  X;in a git repo during a merge
  O;in a git repo during a rebase
@@ -56,8 +57,8 @@ c;l.
 returns the number that was passed in to allow the user to re-run the program
 and get the same results. If there's an internal error
 .Nm
-returns 1. If you wish to find out more infomation about the error enable ERR
-in the config.mk.
+returns 1. If you wish to find out more infomation about the error pass in
+-Derr at build time.
 .Sh OPTIONS
 .Ss -v
 Print version information to stdout and exit.