Remove non-ascii & unprintable characters

These non-ascii & unprintable characters aren't needed.

Change-Id: I129f729f66d6a692de729d76971f7deb7a19c254
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/15977
Tested-by: build bot (Jenkins)
Reviewed-by: Omar Pakker
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/inteltool/cpu.c

@@ -1003,7 +1003,7 @@ int print_intel_core_msrs(void)
 
 /*
  * The following two tables are the Silvermont registers listed in Table 35-6
- * Intel® 64 and IA-32 Architectures Software Developer’s Manual
+ * Intel® 64 and IA-32 Architectures Software Developer's Manual
  * September 2014
  * Vol. 3C 35-59
  */