Reduce instances of `` '' in manuals.

troff displays these as typographic quotes, but nroff implementations
almost always print them literally, which rarely has the intended effect
with modern fonts, even in stock xterm.
These uses of `` '' can be replaced either with more semantic alternatives
or with Dq, which prints typographic quotes in a UTF-8 locale (but will
automatically fall back to `` '' in an ASCII locale).
improvements and ok schwarze@

src/lib/libc/hash/md5.3

@@ -16,9 +16,9 @@
 .\" If we meet some day, and you think this stuff is worth it, you
 .\" can buy me a beer in return. Poul-Henning Kamp
 .\"
-.\" 	$OpenBSD: md5.3,v 1.2 2014/04/03 15:55:29 beck Exp $
+.\" 	$OpenBSD: md5.3,v 1.3 2014/11/15 14:41:02 bentley Exp $
 .\"
-.Dd $Mdocdate: April 3 2014 $
+.Dd $Mdocdate: November 15 2014 $
 .Dt MD5 3
 .Os
 .Sh NAME
@@ -31,7 +31,7 @@
 .Nm MD5File ,
 .Nm MD5FileChunk ,
 .Nm MD5Data
-.Nd calculate the RSA Data Security, Inc., ``MD5'' message digest
+.Nd calculate the RSA Data Security, Inc., MD5 message digest
 .Sh SYNOPSIS
 .In sys/types.h
 .In md5.h

src/lib/libc/hash/rmd160.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: rmd160.3,v 1.32 2014/03/23 23:27:22 naddy Exp $
+.\"	$OpenBSD: rmd160.3,v 1.33 2014/11/15 14:41:02 bentley Exp $
 .\"
 .\" Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
 .\"
@@ -17,7 +17,7 @@
 .\" See http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html
 .\"	for detailed information about RIPEMD-160.
 .\"
-.Dd $Mdocdate: March 23 2014 $
+.Dd $Mdocdate: November 15 2014 $
 .Dt RMD160 3
 .Os
 .Sh NAME
@@ -30,7 +30,7 @@
 .Nm RMD160File ,
 .Nm RMD160FileChunk ,
 .Nm RMD160Data
-.Nd calculate the ``RIPEMD-160'' message digest
+.Nd calculate the RIPEMD-160 message digest
 .Sh SYNOPSIS
 .In sys/types.h
 .In rmd160.h
@@ -167,7 +167,10 @@ and should be freed using
 when it is no longer needed.
 .Sh EXAMPLES
 The follow code fragment will calculate the digest for
-the string "abc" which is ``0x8eb208f7e05d987a9b044a8e98c6b087f15a0bfc''.
+the string
+.Dq abc
+which is
+.Dq 0x8eb208f7e05d987a9b044a8e98c6b087f15a0bfc .
 .Bd -literal -offset indent
 RMD160_CTX rmd;
 u_int8_t results[RMD160_DIGEST_LENGTH];

src/lib/libc/stdlib/getsubopt.3

@@ -1,4 +1,4 @@
-.\" $OpenBSD: getsubopt.3,v 1.13 2013/06/05 03:39:23 tedu Exp $
+.\" $OpenBSD: getsubopt.3,v 1.14 2014/11/15 14:41:02 bentley Exp $
 .\"
 .\" Copyright (c) 1990, 1991, 1993
 .\"	The Regents of the University of California.  All rights reserved.
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)getsubopt.3	8.1 (Berkeley) 6/9/93
 .\"
-.Dd $Mdocdate: June 5 2013 $
+.Dd $Mdocdate: November 15 2014 $
 .Dt GETSUBOPT 3
 .Os
 .Sh NAME
@@ -107,17 +107,17 @@ char *options, *value;
 while ((ch = getopt(argc, argv, "ab:")) != -1) {
 	switch (ch) {
 	case 'a':
-		/* process ``a'' option */
+		/* process "a" option */
 		break;
 	case 'b':
 		options = optarg;
 		while (*options) {
 			switch (getsubopt(&options, tokens, &value)) {
 			case ONE:
-				/* process ``one'' sub option */
+				/* process "one" sub option */
 				break;
 			case TWO:
-				/* process ``two'' sub option */
+				/* process "two" sub option */
 				if (!value)
 					error("no value for two");
 				i = atoi(value);