Auto generate docs

Author: Davidyz

doc/VectorCode-cli.txt

@@ -682,7 +682,10 @@ VECTORCODE VECTORISE
 
 The output is in JSON format. It contains a dictionary with the following
 fields: - `"add"`number of added documents; - `"update"`number of updated
-documents; - `"removed"`number of removed documents;
+documents; - `"removed"`number of removed documents; - `"skipped"`number of
+skipped documents (because it’s empty or its hash matches the metadata saved
+in the database); - `"failed"`number of documents that failed to be vectorised.
+This is usually due to encoding issues.
 
 
 VECTORCODE LS