soup_uri_to_string: document that passwords are never output
soup_uri_to_string: document that passwords are never output

jwendell/libsoup,jwendell/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup