Two or More `First' Lines
=========================
To create two or more `first' or header lines for a definition, follow
the first `@deffn' line by a line beginning with `@deffnx'. The
`@deffnx' command works exactly like `@deffn' except that it does not
generate extra vertical white space between it and the preceding line.
For example,
@deffn {Interactive Command} isearch-forward
@deffnx {Interactive Command} isearch-backward
These two search commands are similar except ...
@end deffn
produces
- Interactive Command: isearch-forward
- Interactive Command: isearch-backward
These two search commands are similar except ...
Each definition command has an `x' form: `@defunx', `@defvrx',
`@deftypefunx', etc.
The `x' forms work just like `@itemx'; see Note:`@itemx'.