Add docs on multiline comments

modules/ROOT/pages/syntax/comments.adoc

@@ -1,11 +1,13 @@
-:description: This section describes how how to use comments in Cypher.
+:description: This section describes how to use comments in Cypher.
 
 [[cypher-comments]]
 = Comments
 
-This page describes how how to use comments in Cypher.
+This page describes how to use comments in Cypher.
 
-A comment begin with double slash (`//`) and continue to the end of the line.
+A single line comment begins with double slash (`//`) and continues to the end of the line.
+A multi-line comment begins with a slash and asterisk (`/*`) and continues until the closing of the comment, which is done with an asterisk and a slash ('*/'
+)
 Comments do not execute, they are for humans to read.
 
 Examples:
@@ -22,6 +24,14 @@ MATCH (n)
 RETURN n
 ----
 
+[source, cypher, indent=0]
+----
+MATCH (n) /* This is a multi line comment,
+the comment is still going on this line as well
+but we are closing it on this line */
+RETURN n
+----
+
 [source, cypher, indent=0]
 ----
 MATCH (n) WHERE n.property = '//This is NOT a comment' RETURN n