doc: fix some inconsistent use of hostname

doc/api/async_hooks.md

@@ -296,7 +296,7 @@ of propagating what resource is responsible for the new resource's existence.
 been initialized. This can contain useful information that can vary based on
 the value of `type`. For instance, for the `GETADDRINFOREQWRAP` resource type,
 `resource` provides the hostname used when looking up the IP address for the
-hostname in `net.Server.listen()`. The API for accessing this information is
+host in `net.Server.listen()`. The API for accessing this information is
 currently not considered public, but using the Embedder API, users can provide
 and document their own resource objects. For example, such a resource object
 could contain the SQL query being executed.

doc/api/http.md

@@ -368,7 +368,7 @@ proxy.listen(1337, '127.0.0.1', () => {
   // make a request to a tunneling proxy
   const options = {
     port: 1337,
-    hostname: '127.0.0.1',
+    host: '127.0.0.1',
     method: 'CONNECT',
     path: 'www.google.com:80'
   };
@@ -415,7 +415,7 @@ event is emitted with a callback containing an object with a status code.
 const http = require('http');
 
 const options = {
-  hostname: '127.0.0.1',
+  host: '127.0.0.1',
   port: 8080,
   path: '/length_request'
 };
@@ -502,7 +502,7 @@ srv.listen(1337, '127.0.0.1', () => {
   // make a request
   const options = {
     port: 1337,
-    hostname: '127.0.0.1',
+    host: '127.0.0.1',
     headers: {
       'Connection': 'Upgrade',
       'Upgrade': 'websocket'
@@ -1898,14 +1898,14 @@ changes:
   * `host` {string} A domain name or IP address of the server to issue the
     request to. **Default:** `'localhost'`.
   * `hostname` {string} Alias for `host`. To support [`url.parse()`][],
-    `hostname` is preferred over `host`.
-  * `family` {number} IP address family to use when resolving `host` and
+    `hostname` will be used if both `host` and `hostname` are specified.
+  * `family` {number} IP address family to use when resolving `host` or
     `hostname`. Valid values are `4` or `6`. When unspecified, both IP v4 and
     v6 will be used.
   * `port` {number} Port of remote server. **Default:** `80`.
   * `localAddress` {string} Local interface to bind for network connections.
-  * `socketPath` {string} Unix Domain Socket (use one of `host:port` or
-    `socketPath`).
+  * `socketPath` {string} Unix Domain Socket (cannot be used if one of `host`
+     or `port` is specified, those specify a TCP Socket).
   * `method` {string} A string specifying the HTTP request method. **Default:**
     `'GET'`.
   * `path` {string} Request path. Should include query string if any.

doc/api/tls.md

@@ -811,14 +811,15 @@ decrease overall server throughput.
 added: v0.8.4
 -->
 
-* `hostname` {string} The hostname to verify the certificate against
+* `hostname` {string} The host name or IP address to verify the certificate
+  against.
 * `cert` {Object} An object representing the peer's certificate. The returned
   object has some properties corresponding to the fields of the certificate.
 * Returns: {Error|undefined}
 
 Verifies the certificate `cert` is issued to `hostname`.
 
-Returns {Error} object, populating it with the reason, host, and cert on
+Returns {Error} object, populating it with `reason`, `host`, and `cert` on
 failure. On success, returns {undefined}.
 
 This function can be overwritten by providing alternative function as part of