What about the following additional change to debugging.texi?  It may
not be that surprising that if you can not step through a
byte-compiled function, you can not step through a primitive function
either, but it may not hurt to explicitly mention it.

I can install if desired.

===File ~/debugging.texi-diff===============================
*** debugging.texi 14 Jun 2005 08:19:54 -0500 1.32
--- debugging.texi 15 Jun 2005 13:33:13 -0500
***************
*** 350,356 ****
  byte-compiled function.  If you would like to step through a
  byte-compiled function, replace it with an interpreted definition of
  the same function.  (To do this, visit the source for the function and
! type @kbd{C-M-x} on its definition.)
  
    Here is a list of Debugger mode commands:
  
--- 350,357 ----
  byte-compiled function.  If you would like to step through a
  byte-compiled function, replace it with an interpreted definition of
  the same function.  (To do this, visit the source for the function and
! type @kbd{C-M-x} on its definition.)  There is no way to step through
! a primitive function.
  
    Here is a list of Debugger mode commands:
  
============================================================


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