curl.1: remove URL encoding phrase from --data description

chunk that looks like \&'name=daniel&skill=lousy'.

If you start the data with the letter @, the rest should be a file name to

read the data from, or - if you want curl to read the data from stdin.  The

contents of the file must already be URL-encoded. Multiple files can also be

specified. Posting data from a file named 'foobar' would thus be done with

\fI--data\fP @foobar. When --data is told to read from a file like that,

carriage returns and newlines will be stripped out.

read the data from, or - if you want curl to read the data from

stdin. Multiple files can also be specified. Posting data from a file

named 'foobar' would thus be done with \fI--data\fP @foobar. When --data is

told to read from a file like that, carriage returns and newlines will be

stripped out.

.IP "-D, --dump-header <file>"

Write the protocol headers to the specified file.