opts: Use common wording for user/password option names

.\"

.TH CURLOPT_PROXYPASSWORD 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"

.SH NAME

CURLOPT_PROXYPASSWORD \- password to use in authentication with proxy

CURLOPT_PROXYPASSWORD \- password to use with proxy authentication

.SH SYNOPSIS

#include <curl/curl.h>

.\"

.TH CURLOPT_PROXYUSERNAME 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"

.SH NAME

CURLOPT_PROXYUSERNAME \- username to authenticate with a proxy

CURLOPT_PROXYUSERNAME \- user name to use with proxy authentication

.SH SYNOPSIS

.nf

#include <curl/curl.h>

.\"

.TH CURLOPT_PROXYUSERPWD 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"

.SH NAME

CURLOPT_PROXYUSERPWD \- set user and password to use for the proxy

CURLOPT_PROXYUSERPWD \- user name and password to use with proxy authentication

.SH SYNOPSIS

#include <curl/curl.h>

.\"

.TH CURLOPT_USERNAME 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"

.SH NAME

CURLOPT_USERNAME \- username to authenticate with

CURLOPT_USERNAME \- user name to use in authentication

.SH SYNOPSIS

.nf

#include <curl/curl.h>

.\"

.TH CURLOPT_USERPWD 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"

.SH NAME

CURLOPT_USERPWD \- set user + password to work with

CURLOPT_USERPWD \- user name and password to use in authentication

.SH SYNOPSIS

#include <curl/curl.h>