Created attachment 142210 [details]
Input for the example

$ cat Doxyfile 
PROJECT_NAME           = "globus ftp control"
PROJECT_NUMBER         = 2.10
INPUT                  = .
FILE_PATTERNS          = *.doc
GENERATE_MAN           = YES
MAN_EXTENSION          = .3

(The input file is attached.)

Running doxygen produces a man page containing:

.PP
\fBPARALLEL\fP.RS 4
The server supports the SPOR, SPAS, the RETR options mentioned above, and
extended block mode.
.RE
.PP
\fBESTO\fP.RS 4
The server implements the ESTO command as described in this document.
.RE

This does not parse well in man. The expected output that would work is:

.PP
\fBPARALLEL\fP
.RS 4
The server supports the SPOR, SPAS, the RETR options mentioned above, and
extended block mode.
.RE
.PP
\fBESTO\fP
.RS 4
The server implements the ESTO command as described in this document.
.RE

I.e. there is a missing newline before .RS