fix scaffolding.ttl with terminating dot after last @prefix

[neeraj9]

Description

fix scaffolding.ttl with terminating dot after last @Prefix

Fixes: #2092

Checklist:

Note: I have not spent much time looking at the overall project, but this change appears reasonably small and tested the file scaffolding.ttl in my private project with python rdflib. Please let me know if I must understand the overall project and only then complete the checklist before re-submitting the patch.

• I'm familiar with the FIBO developer quide. My contribution meets all the requirements described there.
• My contribution follows the principles of best practices for FIBO.
• My changes have been reconciled with latest master and no merge conflicts remain.
• This PR is related to exactly one issue. The issue is referenced by using a GitHub keyword such as "fixes", "closes", or "resolves".
• Hygiene tests have been applied by a PR with "(WIP)" in title.
• The issue has been tested locally using a reasoner (for ontology changes).