Two minor fixes:

Two minor fixes:
o It is the /usr/include files, not the /usr include files.
o Document the practice of converting to the c99 standard uintXX_t
  form from the older, but non-standard, BSD-style u_intXX_t.  This
  has been going on in the tree for a while now, and I've heard other
  developers also state that this conversion is happening.  Note also
  that this is a slow process and should be treated like whitespace
  changes.