Improve won-ext-schema documentation
# How To Generate the schema.org Socket Definitions
1. Download the vocabulary
The schema.org vocabulary can be downloaded here: https://schema.org/docs/developers.html#defs
-2 Import into RDF your store
-3. Executing the sparql query in this folder with curl on a sparql endpoint
+2 Import into your RDF store
+3. Execute the sparql query in this folder with curl on a sparql endpoint
+
Assuming that the graph 'test4' on the specified endpoint contains the schema.org vocabulary, this query generates the corresponding socket definitions:
```
curl -i -H "Accept: application/x-turtle" --data-urlencode query@sparql-construct-for-generating-socketdefs.rq http://satvm05.researchstudio.at:9999/blazegraph/namespace/test4/sparql > won-ext-schema.ttl
