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>

src/arch/x86/acpigen.c

@@ -222,9 +222,9 @@ void acpigen_write_string(const char *string)
 
 /*
  * The naming conventions for ACPI namespace names are a bit tricky as
- * each element has to be 4 chars wide (»All names are a fixed 32 bits.«)
- * and »By convention, when an ASL compiler pads a name shorter than 4
- * characters, it is done so with trailing underscores (‘_’).«.
+ * each element has to be 4 chars wide ("All names are a fixed 32 bits.")
+ * and "By convention, when an ASL compiler pads a name shorter than 4
+ * characters, it is done so with trailing underscores ('_')".
  *
  * Check sections 5.3, 18.2.2 and 18.4 of ACPI spec 3.0 for details.
  */

src/arch/x86/smbios.c

@@ -16,7 +16,7 @@
  */
 
 /*
- * Standard Manufacturer’s Identification Code
+ * Standard Manufacturer's Identification Code
  * JEP106AS (Revision of JEP106AR, October 2015)
  * MAY 2016
  * http://www.jedec.org/standards-documents/results/JEP106AS