add some info how to use the symbol upload script

Change-Id: Ic1d1b57966661b6012efcda0b007b9e75b6be0ef
Reviewed-on: https://gerrit.libreoffice.org/26650
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Jenkins <ci@libreoffice.org>
diff --git a/bin/upload_symbols.py b/bin/upload_symbols.py
index d382f70..f708797 100755
--- a/bin/upload_symbols.py
+++ b/bin/upload_symbols.py
@@ -16,6 +16,7 @@ def main():
    if len(sys.argv) != 4:
        print(sys.argv)
        print("Invalid number of parameters")
        print("Usage: upload-symbols.py symbols.zip config.ini \"long explanation\"")
        sys.exit(1)

    upload_url = "http://crashreport.libreoffice.org/upload/"