Add documentation for missing options

docs/UserManual.md

@@ -77,7 +77,14 @@ CivetWeb can also be used to modify `.htpasswd` passwords files:
     CivetWeb -A <htpasswd_file> <realm> <user> <passwd>
 
 
-# Pattern matching
+Configuration Options
+----
+
+Below is a list of configuration options understood by CivetWeb.
+Every option is followed by it's default value. If a default value is not
+present, then the default is empty.
+
+## Pattern matching in configuration options
 
 CivetWeb uses shell-like glob patterns for several configuration options,
 e.g., CGI, SSI and Lua script files are recognized by the file name pattern. 
@@ -97,12 +104,6 @@ All other characters in the pattern match themselves. Examples:
     **a$|**b$    Any string that ends with a or b
 
 
-# Configuration Options
-
-Below is a list of configuration options understood by CivetWeb.
-Every option is followed by it's default value. If a default value is not
-present, then the default is empty.
-
 ## Options from `civetweb.c`
 
 The following options are supported in `civetweb.c`. They can be used for
@@ -420,6 +421,9 @@ directly to the client. Lua script parts are delimited from the standard
 content by including them between <? and ?> tags.
 An example can be found in the test directory.
 
+### lua\_websocket\_pattern `"**.lua$`
+A pattern for websocket script files that are interpreted as Lua scripts by the server.
+
 ### listening\_ports `8080`
 Comma-separated list of ports to listen on. If the port is SSL, a
 letter `s` must be appended, for example, `80,443s` will open
@@ -558,6 +562,9 @@ and it must have both, private key and certificate, see for example
 [ssl_cert.pem](https://github.com/civetweb/civetweb/blob/master/resources/ssl_cert.pem)
 A description how to create a certificate can be found in doc/OpenSSL.md
 
+### ssl\_certificate\_chain
+Path to an SSL certificate chain file. As a default, the ssl\_certificate file is used.
+
 ### ssl\_cipher\_list
 List of ciphers to present to the client. Entries should be separated by
 colons, commas or spaces.
@@ -723,6 +730,9 @@ A domain configuration file may have the same options as the main server, with
 some exceptions.  The options are passed to the `mg_start_domain` API function.
 
 
+Scripting
+----
+
 # Lua Scripts and Lua Server Pages
 Pre-built Windows and Mac CivetWeb binaries have built-in Lua scripting
 support as well as support for Lua Server Pages.
@@ -956,6 +966,9 @@ logging/debugging), the CGI script should redirect stderr to a
 user defined log file at the beginning of the script.
 
 
+FAQ
+----
+
 # Common Problems
 - PHP doesn't work - getting empty page, or 'File not found' error. The
   reason for that is wrong paths to the interpreter. Remember that with PHP,