some markup and punctuation fixes from wiz@netbsd

src/lib/libc/hash/sha2.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: sha2.3,v 1.11 2004/06/22 01:57:29 jfb Exp $
+.\"	$OpenBSD: sha2.3,v 1.12 2005/09/12 10:33:29 jmc Exp $
 .\"
 .\" Copyright (c) 2003, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
 .\"
@@ -146,7 +146,7 @@ function is used by
 to hash 512-bit blocks and forms the core of the algorithm.
 Most programs should use the interface provided by
 .Fn SHA256_Init ,
-.Fn SHA256_Update
+.Fn SHA256_Update ,
 and
 .Fn SHA256_Final
 instead of calling
@@ -167,7 +167,9 @@ function calculates the digest for a file and returns the result via
 .Fn SHA256_End .
 If
 .Fn SHA256_File
-is unable to open the file, a NULL pointer is returned.
+is unable to open the file, a
+.Dv NULL
+pointer is returned.
 .Pp
 .Fn SHA256_FileChunk
 behaves like
@@ -203,11 +205,13 @@ functions the
 parameter should either be a string large enough to hold the resulting digest
 (e.g.\&
 .Ev SHA256_DIGEST_STRING_LENGTH ,
-.Ev SHA384_DIGEST_STRING_LENGTH
+.Ev SHA384_DIGEST_STRING_LENGTH ,
 or
 .Ev SHA512_DIGEST_STRING_LENGTH ,
 depending on the function being used)
-or a NULL pointer.
+or a
+.Dv NULL
+pointer.
 In the latter case, space will be dynamically allocated via
 .Xr malloc 3
 and should be freed using
@@ -232,7 +236,7 @@ SHA256_Final(results, &ctx);
 
 /* Print the digest as one long hex value */
 printf("0x");
-for (n = 0; n < SHA256_DIGEST_LENGTH; n++)
+for (n = 0; n \*(Lt SHA256_DIGEST_LENGTH; n++)
 	printf("%02x", results[n]);
 putchar('\en');
 .Ed
@@ -272,7 +276,7 @@ helper functions are derived from code written by Poul-Henning Kamp.
 This implementation of the Secure Hash Standard has not been validated by
 NIST and as such is not in official compliance with the standard.
 .Pp
-If a message digest is to be copied to a multi-byte type (ie:
+If a message digest is to be copied to a multi-byte type (i.e.\&
 an array of five 32-bit integers) it will be necessary to
 perform byte swapping on little endian machines such as the i386, alpha,
 and vax.