doc: Fix inaccuracy in https.request docs

PR-URL: https://github.com/nodejs/node/pull/9453
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Sam Roberts <sam@strongloop.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>

doc/api/https.md

@@ -192,8 +192,7 @@ The options argument has the following options
  - `false`: opts out of connection pooling with an Agent, defaults request to
    `Connection: close`.
 
-The following options from [`tls.connect()`][] can also be specified. However, a
-[`globalAgent`][] silently ignores these.
+The following options from [`tls.connect()`][] can also be specified:
 
 - `pfx`: Certificate, Private key and CA certificates to use for SSL. Default `null`.
 - `key`: Private key to use for SSL. Default `null`.