add new context arg to libwebsockets_serve_http_file

Signed-off-by: Andy Green <andy.green@linaro.org>
diff --git a/lib/parsers.c b/lib/parsers.c
index 4da1cff..3d2139c 100644
--- a/lib/parsers.c
+++ b/lib/parsers.c
@@ -1979,6 +1979,7 @@
 
 /**
  * libwebsockets_serve_http_file() - Send a file back to the client using http
+ * @context:		libwebsockets context
  * @wsi:		Websocket instance (available from user callback)
  * @file:		The file to issue over http
  * @content_type:	The http content type, eg, text/html
diff --git a/libwebsockets-api-doc.html b/libwebsockets-api-doc.html
index ed43e09..927573a 100644
--- a/libwebsockets-api-doc.html
+++ b/libwebsockets-api-doc.html
@@ -417,6 +417,8 @@
 <i>const char *</i> <b>content_type</b>)
 <h3>Arguments</h3>
 <dl>
+<dt><b>context</b>
+<dd>libwebsockets context
 <dt><b>wsi</b>
 <dd>Websocket instance (available from user callback)
 <dt><b>file</b>