Towards v11.2.0

[steve-chavez]

Closes #644.

[laurenceisla]

Since we're reverting using computed columns for disambiguation. I made two possible alternatives:

1. Keeping the "Multiple M2O" and "Multiple O2M" examples: 25549d7
2. Keeping the old structure using "Hint" with vews as example. But with a new title: "Multiple FK Relationships to Many Resources": a612db9

The first version is more straightforward but it's not that accurate since only the foreign key can be used for both those cases (m2o and o2m), which is simpler.

The second one is more accurate in explaining when it's needed, but not so straightforward as the previous one.

[steve-chavez]

"Multiple FK Relationships to Many Resources"

Since we're explaining FK joins as a database concern, the term "resources" doesn't seem fit. I've removed that part and restored the previous examples plus used the hint syntax.

[steve-chavez]

Looks good.

Will merge now despite having a broken link on https://github.com/PostgREST/postgrest/releases/tag/v11.2.0. It will be fixed once the core repo has a release.

Doing PostgREST/postgrest#2814 will prevent getting that error later.