Manual.rst: for subrecords add class 'qfq-table-80' - dynamic column width.

extension/Documentation/Manual.rst

@@ -3092,7 +3092,7 @@ will be rendered inside the form as a HTML table.
     * *Constant '&'*: Indicate a 'constant' value. E.g. `&12:xId` or `{{...}}` (all possibilities, incl. further SELECT
       statements) might be used.
 
-  * *subrecordTableClass*: Optional. Default: 'table table-hover'. If given, the default will be overwritten.
+  * *subrecordTableClass*: Optional. Default: 'table table-hover qfq-table-80'. If given, the default will be overwritten.
 
 Type: time
 ^^^^^^^^^^