DOC update doc string

README.md

@@ -126,9 +126,9 @@ You can use the `des-archive-access-download` command to download files from the
 
 ```bash
 $ des-archive-access-download --help
-usage: des-archive-access-download [-h] [-l LIST] [-a ARCHIVE] [-d DESDATA] [-f] [file]
+usage: des-archive-access-download [-h] [-l LIST] [-a ARCHIVE] [-d DESDATA] [-f] [--debug] [file]
 
-download files from the DES archive at FNAL
+Download files from the DES archive at FNAL.
 
 positional arguments:
   file                  file to download
@@ -140,12 +140,9 @@ options:
                         HTTPS address of the FNAL archive
   -d DESDATA, --desdata DESDATA
                         The destination DESDATA directory.
-  -f, --force           force the download even if data already exists
+  -f, --force           Force the download even if data already exists
+  --debug               Print the 'curl' command and stderr to help debug connection and download issues.
 $ des-archive-access-download OPS/finalcut/Y6A1/20181129-r4056/D00797980/p01/red/immask/D00797980_r_c27_r4056p01_immasked.fits.fz
-  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
-                                 Dload  Upload   Total   Spent    Left  Speed
-  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
-100 14.1M  100 14.1M    0     0  13.6M      0  0:00:01  0:00:01 --:--:-- 15.3M
 /Users/beckermr/DESDATA/OPS/finalcut/Y6A1/20181129-r4056/D00797980/p01/red/immask/D00797980_r_c27_r4056p01_immasked.fits.fz
 ```