fixes #28

Author: Max-Hailperin

threads.tex

@@ -557,8 +557,9 @@ \section{Switching Between Threads}\label{threads-switching-section}
 looking at the thread-switching code from the Linux operating system
 for the i386 architecture. (The i386 architecture is also known as the
 x86 or IA-32; it is a popular processor architecture used in
-standard personal computer processors such as the Pentium 4 and the
-Athlon.)  If you don't want to see real code, you can skip ahead to
+standard personal computer processors such as Intel's Core, Xeon, and Atom
+families and AMD's FX and Opteron families.)
+If you don't want to see real code, you can skip ahead to
 the paragraph after the block of assembly code.  However, even if you aren't familiar with i386 assembly language, you
 ought to be able to see how this code matches the preceding pattern.