Fixed minor errors in docs

=head1 NAME

PKCS5_PBKDF2_HMAC - password based derivation routine with salt and iteration count

PKCS5_PBKDF2_HMAC, PKCS5_PBKDF2_HMAC_SHA1 - password based derivation routines with salt and iteration count

=head1 SYNOPSIS

                       const EVP_MD *digest,

                       int keylen, unsigned char *out);

int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,

			   const unsigned char *salt, int saltlen, int iter,

			   int keylen, unsigned char *out);

=head1 DESCRIPTION

PKCS5_PBKDF2_HMAC() derives a key from a password using a salt and iteration count

B<salt> is the salt used in the derivation of length B<saltlen>. If the

B<salt> is NULL, then B<saltlen> must be 0. The function will not

attempt to calculate the length of the B<salt> because its not assumed to

attempt to calculate the length of the B<salt> because it is not assumed to

be NULL terminated.

B<iter> is the iteration count and its value should be greater than or 

equal to 1. RFC 2898 suggests an iteration count of at least 1000. Any

B<iter> less than 1 is treated as a single iteration.

B<digest> is message digest function used in the derivation. Values include

B<digest> is the message digest function used in the derivation. Values include

any of the EVP_* message digests. PKCS5_PBKDF2_HMAC_SHA1() calls

PKCS5_PBKDF2_HMAC() with EVP_sha1().

=head1 RETURN VALUES

PKCS5_PBKDF2_HMAC() returns 1 on success or 0 on error.

PKCS5_PBKDF2_HMAC() and PBKCS5_PBKDF2_HMAC_SHA1() return 1 on success or 0 on error.

=head1 SEE ALSO