Misuse of “relation” instead of “relationship” in ER diagram section title

[shogo82148]

It seems that the documents generated by tbls confuse the terms "relation" and "relationship".

Terminology

In SQL terminology, a “table” corresponds to a "relation" in relational database terminology.

In a relational database, a relation is a set of tuples that have the same attributes.

— https://en.wikipedia.org/wiki/Relational_database

"Relationships" are a logical connection between different tables.

Relationships are a logical connection between different tables (entities), established on the basis of interaction among these tables.

— https://en.wikipedia.org/wiki/Relational_database

Current behavior

For example, tbls generates ER-diagram in a section titled "relations".

Expected behavior

the section title should be "relationship" instead of "relation".
because ER-diagram stands for Entity-Relationship diagram, not Entity-Relation diagram.

[k1LoW]

Yeah, that's right...
We want to migrate smoothly, but it's still undecided at this point.