[docs] Describe new serialization preferences

docs/docs.md

@@ -147,11 +147,13 @@ saving the module to the database (e.g., as `/db/test.xqm`) and selecting "XQuer
 
 ## Options for XML documents loaded from the database
 
-When loading XML documents from the database into an editor window, you can control whether indentation is automatically applied 
-or not and whether XInclude elements are automatically expanded or not. Set this preference in "Edit > Preferences > When 
-opening or downloading XML documents." The same preference applies to the download of XML documents via "File > Download" and
+When loading XML documents from the database into an editor window, you can control common serialization parameters, such 
+as whether indentation is automatically applied, whether XInclude elements are automatically expanded, and whether XML 
+declarations are omitted. Set these preferences in "Edit > Preferences > Serialization." Additional sets of these preferences 
+are available for download of XML documents via "File > Download" and for
 the serialization of XML documents included in application packages via ["Application > Download app"](#Support-for-EXPath-Packages).
-By default, indentation is turned on and XInclude expansion is turned off.
+By default, indentation is turned on for opening and downloading files but is off for downloading EXPath Packages; XInclude 
+expansion is turned off in all cases; and the XML declaration is omitted in all cases. 
 
 ## Options for displaying query results