sql/parser: unreserve INDEX and NOTHING from the RHS of SET statements

[jseldess]

Jesse Seldess (jseldess) commented:

PR: cockroachdb/cockroach#31731

From release notes:

For compatibility with PostgreSQL, it is once again possible to use the keywords FAMILY, MINVALUE, MAXVALUE, INDEX, and NOTHING as table names, and the names "index" and "nothing" are once again accepted in the right-hand side of SET statement assignments. [#31731][#31731] {% comment %}doc{% endcomment %}

Jira Issue: DOC-204

[jseldess]

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