[feature request] multi-line table description

### Is your proposal related to a problem?

I love the ability to write descriptions for each of my tables, however it's limiting to be forced into a single-line comment. Could we turn these into multi-line strings?

### Describe the solution you'd like

Support for multi-line table descriptions.

### Describe alternatives you've considered

Providing links to more verbose descriptions/documentation elsewhere.

### If the feature is approved, would you be willing to submit a PR?

sure, assuming it's not an engineering nightmare

No files, tests, or entry points are named in the issue. Start by locating the existing table-description handling and determine how multi-line descriptions should be represented and exposed; done means table descriptions can contain multiple lines without requiring external documentation links.

Written by the indexing model from the issue text.