Fix doc description of HTTPClient::request

(cherry picked from commit 422f821be9f57e39199f26e53d109746d5bb46b0)

doc/classes/HTTPClient.xml

@@ -144,14 +144,15 @@
 			<argument index="3" name="body" type="String" default="&quot;&quot;">
 			</argument>
 			<description>
-				Sends a request to the connected host. The URL parameter is just the part after the host, so for [code]http://somehost.com/index.php[/code], it is [code]index.php[/code].
+				Sends a request to the connected host.
+				The URL parameter is usually just the part after the host, so for [code]http://somehost.com/index.php[/code], it is [code]/index.php[/code]. When sending requests to an HTTP proxy server, it should be an absolute URL. For [constant HTTPClient.METHOD_OPTIONS] requests, [code]*[/code] is also allowed. For [constant HTTPClient.METHOD_CONNECT] requests, it should be the authority component ([code]host:port[/code]).
 				Headers are HTTP request headers. For available HTTP methods, see [enum Method].
 				To create a POST request with query strings to push to the server, do:
 				[codeblock]
 				var fields = {"username" : "user", "password" : "pass"}
 				var query_string = http_client.query_string_from_dict(fields)
 				var headers = ["Content-Type: application/x-www-form-urlencoded", "Content-Length: " + str(query_string.length())]
-				var result = http_client.request(http_client.METHOD_POST, "index.php", headers, query_string)
+				var result = http_client.request(http_client.METHOD_POST, "/index.php", headers, query_string)
 				[/codeblock]
 				[b]Note:[/b] The [code]request_data[/code] parameter is ignored if [code]method[/code] is [constant HTTPClient.METHOD_GET]. This is because GET methods can't contain request data. As a workaround, you can pass request data as a query string in the URL. See [method String.http_escape] for an example.
 			</description>
@@ -168,7 +169,8 @@
 			<argument index="3" name="body" type="PoolByteArray">
 			</argument>
 			<description>
-				Sends a raw request to the connected host. The URL parameter is just the part after the host, so for [code]http://somehost.com/index.php[/code], it is [code]index.php[/code].
+				Sends a raw request to the connected host.
+				The URL parameter is usually just the part after the host, so for [code]http://somehost.com/index.php[/code], it is [code]/index.php[/code]. When sending requests to an HTTP proxy server, it should be an absolute URL. For [constant HTTPClient.METHOD_OPTIONS] requests, [code]*[/code] is also allowed. For [constant HTTPClient.METHOD_CONNECT] requests, it should be the authority component ([code]host:port[/code]).
 				Headers are HTTP request headers. For available HTTP methods, see [enum Method].
 				Sends the body data raw, as a byte array and does not encode it in any way.
 			</description>