Add note that feature info geometry needs to be enabled for atlas printing

Author: manisandro

src/topics/Printing.md

@@ -93,6 +93,7 @@ To enable atlas printing in QWC, configure the QGIS project as follows:
 - Check the `Generate an atlas` checkbox in the desired layout in QGIS layout designer → Atlas → Atlas settings, selecting the coverage layer as desired.
 - In the layout map item properties, check `Controlled by Atlas`.
 - In the Project properties → QGIS Server, set `Maximum features for Atlas print requests` to the desired value.
+- In the Project properties → QGIS Server, check `Add geometry to feature response`.
 
 QWC will then display a feature picked in the print dialog which will allow picking the desired atlas features, and QGIS Server will generate a multi-page PDF accordingly.