fix documentation

a oneline format which is more readable than RFC2253. It is equivalent to

specifying the  B<esc_2253>, B<esc_ctrl>, B<esc_msb>, B<utf8>, B<dump_nostr>,

B<dump_der>, B<use_quote>, B<sep_comma_plus_spc>, B<spc_eq> and B<sname>

B<dump_der>, B<use_quote>, B<sep_comma_plus_space>, B<space_eq> and B<sname>

options.

=item B<multiline>

a multiline format. It is equivalent B<esc_ctrl>, B<esc_msb>, B<sep_multiline>,

B<spc_eq>, B<lname> and B<align>.

B<space_eq>, B<lname> and B<align>.

=item B<esc_2253>

align field values for a more readable output. Only usable with

B<sep_multiline>.

=item B<spc_eq>

=item B<space_eq>

places spaces round the B<=> character which follows the field

name.

Display the certificate subject name in oneline form on a terminal

supporting UTF8:

 openssl x509 -in cert.pem -noout -subject -nameopt oneline,-escmsb

 openssl x509 -in cert.pem -noout -subject -nameopt oneline,-esc_msb

Display the certificate MD5 fingerprint:

Escaping takes several forms.

If the character being escaped is a 16 bit character then the form "\WXXXX" is used

If the character being escaped is a 16 bit character then the form "\UXXXX" is used

using exactly four characters for the hex representation. If it is 32 bits then

"\UXXXXXXXX" is used using eight characters of its hex representation. These forms

"\WXXXXXXXX" is used using eight characters of its hex representation. These forms

will only be used if UTF8 conversion is not set (see below).

Printable characters are normally escaped using the backslash '\' character. If