Added a bit of documentation about the new features

Author: jbtronics

docs/usage/import_export.md

@@ -142,6 +142,9 @@ You can select between the following export formats:
   efficiently.
 * **YAML** (Yet Another Markup Language): Very similar to JSON
 * **XML** (Extensible Markup Language): Good support with nested data structures. Similar use cases as JSON and YAML.
+* **Excel**: Similar to CSV, but in a native Excel format. Can be opened in Excel and LibreOffice Calc. Does not support nested
+  data structures or sub-data (like parameters, attachments, etc.), very well (many columns are generated, as every
+  possible sub-data is exported as a separate column).
 
 Also, you can select between the following export levels:
 

docs/usage/information_provider_system.md

@@ -68,6 +68,13 @@ If you already have attachment types for images and datasheets and want the info
 can
 add the alternative names "Datasheet" and "Image" to the alternative names field of the attachment types.
 
+## Bulk import
+
+If you want to update the information of multiple parts, you can use the bulk import system: Go to a part table and select
+the parts you want to update. In the bulk actions dropdown select "Bulk info provider import" and click "Apply".
+You will be redirected to a page, where you can select how part fields should be mapped to info provider fields, and the 
+results will be shown.
+
 ## Data providers
 
 The system tries to be as flexible as possible, so many different information sources can be used.