...and revised the proxy wording a little as well.
.\"
.TH CURLOPT_PROXYUSERNAME 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
-CURLOPT_PROXYUSERNAME \- user name to use with proxy authentication
+CURLOPT_PROXYUSERNAME \- user name to use for 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 \- user name and password to use with proxy authentication
+CURLOPT_PROXYUSERPWD \- user name and password to use for proxy authentication
.SH SYNOPSIS
#include <curl/curl.h>
.\"
.TH CURLOPT_TLSAUTH_PASSWORD 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
-CURLOPT_TLSAUTH_PASSWORD \- TLS authentication password
+CURLOPT_TLSAUTH_PASSWORD \- password to use for TLS authentication
.SH SYNOPSIS
#include <curl/curl.h>
.\"
.TH CURLOPT_TLSAUTH_USERNAME 3 "19 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
.SH NAME
-CURLOPT_TLSAUTH_USERNAME \- user name for TLS authentication
+CURLOPT_TLSAUTH_USERNAME \- user name to use for TLS authentication
.SH SYNOPSIS
#include <curl/curl.h>