Docs Refer to incorrect module domains

[mazz]

Meilisearch.Index => Meilisearch.Indexes
Meilisearch.Document => Meilisearch.Documents

There may be more ..

[robottokauf3]

Good catch. I'll go through this weekend and see where I missed updating the docs when renaming the modules.

[oshosanya]

@robottokauf3 Would you welcome a pull request to fix these issues in the docs? I just fell victim to it too.

[robottokauf3]

Updated