Mishandling bold text in collapsible titles

[leemthompo]

Describe the bug

Note

Might be getting into edge-casey territory 😁

Some bold text is mishandled in collapsible titles, revealing markup.

This is migration tooling issue, where asciidoc some pages have bold text immediately succeeding a period in title:

Old asciidoc syntax:

.*Expand* for Elastic prerequisites information
[%collapsible]

Current md syntax:

56::::::{dropdown} **Expand** for Elastic prerequisites information

Expected behavior

Should look this

Steps to reproduce

Jump to http://localhost:3000/es-build-connector.html for an example:

Tooling

• docs-builder
• migration tooling
• I'm not sure

[leemthompo]

Closing as duplicate of #306