document not to use '*' as feature ID in basic-feature.md;

Signed-off-by: Stefan Maute <stefan.maute@bosch.io>

documentation/src/main/resources/pages/ditto/basic-feature.md

@@ -12,10 +12,13 @@ For different contexts or aspects of a Thing different Features can be used whic
 and do not exist without this Thing.
 
 ## Feature ID
-Within a Thing each Feature is identified by a unique string - the so called Feature ID.
-A Feature ID often needs to be set in the path of a HTTP request. Due to this fact we strongly recommend to use a
+Within a Thing each Feature is identified by a unique string - the so-called Feature ID.
+A Feature ID often needs to be set in the path of a HTTP request. Due to this fact we strongly recommend using a
 restricted set of characters (e.g. those for [Uniform Resource Identifiers (URI)](https://www.ietf.org/rfc/rfc3986.txt)).
 
+It is not recommended to use '*' as Feature ID because the '*' has a special meaning and can lead to unexpected
+results when retrieving or searching for things/features.
+
 ## Feature properties
 
 The **data** related to Features is managed in form of a **list of properties**. These properties can be categorized,