cmdline-docs: more options converted over

docs/cmdline-opts/data.d

@@ -0,0 +1,30 @@
+Long: data
+Short: d
+Arg: <data>
+Help: HTTP POST data
+Protocols: HTTP
+See-also: data-binary data-urlencode data-raw
+Mutexed: form head upload
+---
+Sends the specified data in a POST request to the HTTP server, in the same way
+that a browser does when a user has filled in an HTML form and presses the
+submit button. This will cause curl to pass the data to the server using the
+content-type application/x-www-form-urlencoded.  Compare to --form.
+
+--data-raw is almost the same but does not have a special interpretation of
+the @ character. To post data purely binary, you should instead use the
+--data-binary option.  To URL-encode the value of a form field you may use
+--data-urlencode.
+
+If any of these options is used more than once on the same command line, the
+data pieces specified will be merged together with a separating
+&-symbol. Thus, using '-d name=daniel -d skill=lousy' would generate a post
+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. 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. If you don't want the @ character to have a special interpretation use
+--data-raw instead.