openssl-3.0#20290: Fixed typo in "config" man page

CLA: trivial

Reviewed-by: Todd Short <todd.short@me.com>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from #20311)

(cherry picked from commit 3da073c)

doc/man5/config.pod

@@ -73,7 +73,7 @@ done with the following directive:
 The default behavior, where the B<value> is B<false> or B<off>, is to treat
 the dollarsign as indicating a variable name; C<foo$bar> is interpreted as
 C<foo> followed by the expansion of the variable C<bar>. If B<value> is
-B<true> or B<on>, then C<foo$bar> is a single seven-character name nad
+B<true> or B<on>, then C<foo$bar> is a single seven-character name and
 variable expansions must be specified using braces or parentheses.
 
  .pragma [=] includedir:value