Improve defaultPrintLayout documentation

Author: manisandro

src/configuration/ThemesConfiguration.md

@@ -148,7 +148,7 @@ The format of the theme definitions is as follows:
 | `⁣  {"s": <Scale1>, "x": <Width1>, "y": <Height1>},` | Keep this list sorted in descending order by scale denominator.           |
 | `⁣  {"s": <Scale2>, "x": <Width2>, "y": <Height2>}`  | In this example, `{x: <Width2>, y: <Height2>}` will be used for `<Scale1> > Scale >= <Scale2>`. |
 | `],`                                            |                                                                                  |
-| `"defaultPrintLayout": "<ID>",`                 | Optional, name print layout to select by default.                                |
+| `"defaultPrintLayout": "<name>",`               | Optional, name of print layout to select by default.                             |
 | `"printLabelForSearchResult": "<ID>",`          | Optional, an ID of a print layout label to which the current search result text (if any) will be written to when printing. |
 | `"printLabelForAttribution": "<ID>",`           | Optional, an ID of a print layout label to which the current attribution text (if any) will be written to when printing. |
 | `"printLabelConfig": {`                         | Optional, configuration of the text input fields for print layout labels.        |

src/topics/Printing.md

@@ -20,6 +20,8 @@ You can enable the option to generate a GeoPDF by setting the Print plugin confi
 
 You can select output format for printing layout. Default values are `application/pdf`, `image/jpeg`, `image/png` and `image/svg`. You can restrict formats to one or more of them by setting the Print plugin config option `formats` to an array of these formats. See [QGIS Server documentation](https://docs.qgis.org/latest/en/docs/server_manual/services/wms.html#wms-getprint-format) for WMS GetPrint supported formats.
 
+Finally, you can configure which print layout is selected by default by setting `defaultPrintLayout` to the name of the desired print layout in the [theme configuration](../configuration/ThemesConfiguration.md#manual-theme-configuration).
+
 Some additional tasks include:
 
 * [Configuring the print background layers](#background-layers)