Document hiding taxonomy menu item (#2459)

* Document hiding taxonomy menu item

* Apply suggestions from code review

---------

Co-authored-by: Tomasz Dąbrowski <[email protected]>

Author: 2 people

code_samples/taxonomy/config/packages/ibexa_taxonomy.yaml

@@ -15,3 +15,4 @@ ibexa_taxonomy:
                 parent: parent_category
                 name: name
             assigned_content_tab: false
+            register_main_menu: false

docs/content_management/taxonomy/taxonomy.md

@@ -67,6 +67,17 @@ In configuration add `assigned_content_tab` with the flag `false` (for other tax
 [[= include_file('code_samples/taxonomy/config/packages/ibexa_taxonomy.yaml', 9, 17) =]]
 ```
 
+### Hide menu item
+
+By default, for each taxonomy, a menu item is added to the main menu.
+You can hide this menu item by setting a value of the `register_main_menu` configuration key:
+
+``` yaml
+[[= include_file('code_samples/taxonomy/config/packages/ibexa_taxonomy.yaml', 0, 2) =]]        # existing keys
+[[= include_file('code_samples/taxonomy/config/packages/ibexa_taxonomy.yaml', 9, 10) =]]            # existing keys
+[[= include_file('code_samples/taxonomy/config/packages/ibexa_taxonomy.yaml', 17, 18) =]]
+```
+
 For more information about available functionalities of tags, see [User Documentation]([[= user_doc =]]/taxonomy).
 
 ## Hide delete button on large subtree