doc(default): add comment on org filter

conf/default.toml

@@ -80,7 +80,8 @@ background_color = "#fdfbff"
 
 # The advanced search filters available to the user can be customized with this setting.
 # The following fields can be used for filtering: 'organization', 'format', 'publicationYear', 'standard', 'inspireKeyword', 'keyword', 'topic', 'isSpatial', 'license', 'resourceType', 'representationType', 'producerOrg', 'publisherOrg'
-# any other field will be ignored
+# If not configured, the default values are 'organization', 'format', 'publicationYear', 'topic', 'isSpatial', 'license'
+# Note that some links in the datahub app set an 'organization' filter. So this field is needed to allow unsetting such filters.
 # advanced_filters = ['organization', 'format', 'publicationYear', 'topic', 'isSpatial', 'license']
 
 # One or several search presets can be defined here; every search preset is composed of:

docs/reference/search-fields.md

@@ -22,6 +22,8 @@ These fields are used in the following context:
 
 This field targets the owner organization of a record. The exact meaning of a record's organization is defined by the "organization strategy" used; see [this documentation page](./organizations.md) for more details.
 
+_Note: The `organization` search field is set by some routing links within the datahub app. It is thus needed to unset such filters._
+
 ### Publisher
 
 > Field id: `publisherOrg`