adds documentation for configurable listener http_* values

website/source/docs/configuration/listener/tcp.html.md

@@ -35,6 +35,24 @@ advertise the correct address to other nodes.
   they need to hop through a TCP load balancer or some other scheme in order to
   talk.
 
+- `http_idle_timeout` `(string: "5m")` - Specifies the maximum amount of time to
+  wait for the next request when keep-alives are enabled. If `http_idle_timeout`
+  is zero, the value of `http_read_timeout` is used. If both are zero, the value of `http_read_header_timeout` is used. This is specified using a label suffix like
+  `"30s"` or `"1h"`.
+
+- `http_read_header_timeout` `(string: "10s")` - Specifies the amount of time
+  allowed to read request headers. This is specified using a label suffix like
+  `"30s"` or `"1h"`.
+
+- `http_read_timeout` `(string: "30s")` - Specifies the maximum duration for
+  reading the entire request, including the body. This is specified using a
+  label suffix like `"30s"` or `"1h"`.
+
+- `http_write_timeout` `string: "0")` - Specifies the maximum duration before
+  timing out writes of the response and is reset whenever a new request's header
+  is read. The default value of `"0"` means inifinity. This is specified using a
+  label suffix like `"30s"` or `"1h"`.
+
 - `max_request_size` `(int: 33554432)` – Specifies a hard maximum allowed
   request size, in bytes. Defaults to 32 MB. Specifying a number less than or
   equal to `0` turns off limiting altogether.