Update API reference to add versions when feature was added

[maryamsulemani97]

Update the API reference to add a note mentioning when the endpoint/feature/field was added to Meilisearch.

For example, the POST /indexes/{index_uid}/documents/fetch was introduced in v1.2. The note could say something like "Only available for v1.2 and above."

To do

• [ ] Update API reference for features added in v1.1
• [ ] Update API reference for features added in v1.2