Update API doc: replace deprecated language code

Replacing 'no' with 'nb' in an example, since 'no'
is deprecated on Wikidata. See
https://www.wikidata.org/wiki/Wikidata:Project_chat/Archive/2014/05#.27als.27.2F.27gsw.27.3F_.27de-formal.27.3F

Change-Id: I9be0981e68ecc39f31895d19d8d6bf88a1ad4cd5
Merge "Update API doc: replace deprecated language code"