Add known limitation around dropping interleaved indexes

[jseldess]

Fixes #1589

[cockroach-teamcity]

This change is 

[jseldess]

@m-schneider, finally adding this as a known limitation for 1.0. Also adding it as a limitation ion 1.1, but once cockroachdb/cockroach#17860 lands, I can remove that.

[cockroach-teamcity]

http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/9f3e54ad88ad175fe901f079032e76daa510001a/

[cockroach-teamcity]

http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/6e955243c61de21627325dd4e951301daead2d49/

[m-schneider]

Review status: 0 of 2 files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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v1.0/known-limitations.md, line 286 at r1 (raw file):

## Dropping an interleaved index prevents DDL operations

When you [drop an interleaved index](drop-index.html) on a table, future DDL operations on the table will fail, for example:

The limitation is only when you drop an interleaved index on the same table. In your example: INTERLEAVE IN PARENT t1 (id2); would fail, but if the parent was t2 or any other table we wouldn't have the problem.

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Comments from Reviewable

[jseldess]

v1.0/known-limitations.md, line 286 at r1 (raw file):

Previously, m-schneider (Masha Schneider) wrote…

The limitation is only when you drop an interleaved index on the same table. In your example: INTERLEAVE IN PARENT t1 (id2); would fail, but if the parent was t2 or any other table we wouldn't have the problem.

Thanks, Masha. Take another look.

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Comments from Reviewable

[cockroach-teamcity]

http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/2185a3f6bff14a7eca2c4f63b9561107a432cf5a/

[m-schneider]

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Review status: 0 of 2 files reviewed at latest revision, 1 unresolved discussion, some commit checks pending.

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v1.0/known-limitations.md, line 286 at r1 (raw file):

Previously, jseldess wrote…

Thanks, Masha. Take another look.

Looks good!

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Comments from Reviewable

[cockroach-teamcity]

http://cockroach-docs-review.s3-website-us-east-1.amazonaws.com/f3f1313d885f5dc9d6daa8afdbcecae319849fff/