[v1.15.0] MMR docs (#1754)

* add mmr to hybrid queries section

* update to new interface

* proofread

* update for renaming `lambda` into `diversity`

* update for `candidates_limit`

* add formula

* fix rust snippet

* docs: Simplified go.md

* docs: Simplify csharp.md

* docs: Simplified java.md

* output is regular scores

---------

Co-authored-by: Anush <anushshetty90@gmail.com>

qdrant-landing/content/documentation/headless/snippets/query-points/hybrid-mmr/rust.md

@@ -0,0 +1,17 @@
+```rust
+use qdrant_client::Qdrant;
+use qdrant_client::qdrant::{PrefetchQueryBuilder, Query, QueryPointsBuilder};
+
+let client = Qdrant::from_url("http://localhost:6334").build()?;
+
+client.query(
+    QueryPointsBuilder::new("{collection_name}")
+        .query(Query::new_nearest_with_mmr(
+            vec![0.01, 0.45, 0.67], // search vector
+            MmrBuilder::new()
+                .diversity(0.5) // 0.0 - relevance; 1.0 - diversity
+                .candidates_limit(100) // num of candidates to preselect
+        ))
+        .limit(10)
+).await?;
+```