asciidoctor.adoc in asciidoctor-2.0.18

- old
+ new

@@ -44,14 +44,15 @@
 === Document Settings
 
 *-a, --attribute*=_ATTRIBUTE_::
   Define, override, or unset a document attribute.
   Command-line attributes take precedence over attributes defined in the source file unless either the name or value ends in _@_.
+  No substitutions are applied to the value.
 +
 _ATTRIBUTE_ is normally formatted as a key-value pair, in the form _NAME=VALUE_.
 Alternate forms are _NAME_ (where the _VALUE_ defaults to an empty string), _NAME!_ (unsets the _NAME_ attribute), and _NAME=VALUE@_ (or _NAME@=VALUE_) (where _VALUE_ does not override the _NAME_ attribute if it's already defined in the source document).
-Values containing spaces should be enclosed in quotes.
+A value containing spaces must be enclosed in quotes, in the form _NAME="VALUE WITH SPACES"_.
 +
 This option may be specified more than once.
 
 *-b, --backend*=_BACKEND_::
   Backend output file format: _html5_, _docbook5_, and _manpage_ are supported out of the box.
@@ -188,14 +189,14 @@
 
 *Project website:* https://asciidoctor.org
 
 *Project documentation:* https://docs.asciidoctor.org
 
+*Community chat:* https://chat.asciidoctor.org
+
 *Source repository:* https://github.com/asciidoctor/asciidoctor
 
-*Community chat:* https://asciidoctor.zulipchat.com
-
-*Discussion list:* https://discuss.asciidoctor.org
+*Mailing list archive:* https://discuss.asciidoctor.org
 
 == Copying
 
 Copyright \(C) 2012-present Dan Allen, Sarah White, Ryan Waldron, and the individual contributors to Asciidoctor.
 Use of this software is granted under the terms of the MIT License.