Fix type-checking errors in snippets (code only, no .md)

This commit both:
- Fixes pre-existing mistakes in snippets, aka wrong code samples.
- Adds hidden (`@hide`) statements that do not appear in the docs,
  but satisfy typecheckers.

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/csharp.cs

@@ -1,13 +1,15 @@
 using Qdrant.Client;
+using Qdrant.Client.Grpc;
 
 public class Snippet
 {
 	public static async Task Run()
 	{
+		var client = new QdrantClient("localhost", 6334); // @hide
 		await client.FacetAsync(
 		    "{collection_name}",
 		    key: "size",
-		    exact: true,
+		    exact: true
 		);
 	}
 }

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/go.go

@@ -1,11 +1,29 @@
 package snippet
 
+// @hide-start
+import (
+    "context"
+
+    "github.com/qdrant/go-client/qdrant"
+)
+// @hide-end
 
 
 func Main() {
-	res, err := client.Facet(ctx, &qdrant.FacetCounts{
+	// @hide-start
+	client, err := qdrant.NewClient(&qdrant.Config{
+	    Host: "localhost",
+	    Port: 6334,
+	})
+	if err != nil { panic(err) }
+	// @hide-end
+
+	res, err := client.Facet(context.Background(), &qdrant.FacetCounts{
 	    CollectionName: "{collection_name}",
 	    Key:            "key",
-	    Exact:          true,
+	    Exact:          qdrant.PtrOf(true),
 	})
+
+	if err != nil { panic(err) } // @hide
+	_ = res // @hide
 }

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/java.java

@@ -1,11 +1,18 @@
 package com.example.snippets_amalgamation;
 
+import io.qdrant.client.grpc.Points.FacetCounts;
+
 public class Snippet {
         public static void run() throws Exception {
+                // @hide-start
+                io.qdrant.client.QdrantClient client =
+                    new io.qdrant.client.QdrantClient(io.qdrant.client.QdrantGrpcClient.newBuilder("localhost", 6334, false).build());
+                // @hide-end
+
                 client
                       .facetAsync(
-                          Points.FacetCounts.newBuilder()
-                              .setCollectionName(collection_name)
+                          FacetCounts.newBuilder()
+                              .setCollectionName("{collection_name}")
                               .setKey("foo")
                               .setExact(true)
                               .build())

qdrant-landing/content/documentation/headless/snippets/facet-counts/exact/rust.rs

@@ -1,6 +1,8 @@
 use qdrant_client::qdrant::FacetCountsBuilder;
 
 pub async fn main() -> anyhow::Result<()> {
+    let client = qdrant_client::Qdrant::from_url("http://localhost:6334").build()?; // @hide
+
     client
         .facet(
              FacetCountsBuilder::new("{collection_name}", "size")

qdrant-landing/content/documentation/headless/snippets/facet-counts/simple-with-filter/go.go

@@ -12,7 +12,9 @@ func Main() {
 	    Port: 6334,
 	})
 
-	res, err := client.Facet(ctx, &qdrant.FacetCounts{
+	if err != nil { panic(err) } // @hide
+
+	res, err := client.Facet(context.Background(), &qdrant.FacetCounts{
 	    CollectionName: "{collection_name}",
 	    Key:            "size",
 	        Filter: &qdrant.Filter{
@@ -21,4 +23,7 @@ func Main() {
 	        },
 	    },
 	})
+
+	if err != nil { panic(err) } // @hide
+	_ = res // @hide
 }

qdrant-landing/content/documentation/headless/snippets/facet-counts/simple-with-filter/java.java

@@ -4,7 +4,7 @@ import static io.qdrant.client.ConditionFactory.matchKeyword;
 
 import io.qdrant.client.QdrantClient;
 import io.qdrant.client.QdrantGrpcClient;
-import io.qdrant.client.grpc.Filter;
+import io.qdrant.client.grpc.Common.Filter;
 import io.qdrant.client.grpc.Points;
 
 public class Snippet {
@@ -15,7 +15,7 @@ public class Snippet {
                 client
                     .facetAsync(
                         Points.FacetCounts.newBuilder()
-                            .setCollectionName(collection_name)
+                            .setCollectionName("{collection_name}")
                             .setKey("size")
                             .setFilter(Filter.newBuilder().addMust(matchKeyword("color", "red")).build())
                             .build())

qdrant-landing/content/documentation/headless/snippets/facet-counts/simple-with-filter/python.py

@@ -5,5 +5,12 @@ client = QdrantClient(url="http://localhost:6333")
 client.facet(
     collection_name="{collection_name}",
     key="size",
-    facet_filter=models.Filter(must=[models.Match("color", "red")]),
+    facet_filter=models.Filter(
+        must=[
+            models.FieldCondition(
+                key="color",
+                match=models.MatchValue(value="red"),
+            )
+        ]
+    ),
 )