lib: fix typo in comment in _http_client.js

Signed-off-by: agape1225 <49804691+agape1225@users.noreply.github.com>
PR-URL: #64729
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Daeyeon Jeong <daeyeon.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Aviv Keller <me@aviv.sh>

Author: agape1225

lib/_http_client.js

@@ -296,7 +296,7 @@ function rewriteForProxiedHttp(req, reqOptions, proxyAuthority, userHostHeader,
     // so a rejected request doesn't leave proxy-* headers stuck on the outgoing header store.
     // XXX(joyeecheung): This validates whether the request conforms to the RFC, but here
     // we only do it for proxied requests for backward compatibility. For non-proxied requests,
-    // ensuring thst the request is well formed has been entirely left to the user.
+    // ensuring that the request is well formed has been entirely left to the user.
     const result = validateRequestAuthority(req.path, proxyAuthority, userHostHeader, headerArray);
     if (headerArray === undefined) {
       const currentHost = req.getHeader('host');