Add ASCII Folding docs for 1.16

qdrant-landing/content/documentation/headless/snippets/create-payload-index/asciifolding-full-text/_description.md

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+This code snippet demonstrates how to create a full-text index with ASCII folding support for a specified field in a collection. The index configuration includes details such as the field name, type (text), tokenizer (word), and whether to ASCII-fold tokens. This setup enables filtering points based on the presence of specific words while ignoring diacritics in the field, allowing for efficient full-text search functionality within the payload.

qdrant-landing/content/documentation/headless/snippets/create-payload-index/asciifolding-full-text/http.md

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+```http
+PUT /collections/{collection_name}/index
+{
+    "field_name": "name_of_the_field_to_index",
+    "field_schema": {
+        "type": "text",
+        "tokenizer": "word",
+        "ascii_folding": true
+    }
+}
+```

qdrant-landing/content/documentation/headless/snippets/create-payload-index/asciifolding-full-text/typescript.md

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+```typescript
+import { QdrantClient } from "@qdrant/js-client-rest";
+
+const client = new QdrantClient({ host: "localhost", port: 6333 });
+
+client.createPayloadIndex("{collection_name}", {
+  field_name: "name_of_the_field_to_index",
+  field_schema: {
+    type: "text",
+    tokenizer: "word",
+    ascii_folding: true,
+  },
+});
+```

qdrant-landing/content/documentation/headless/snippets/create-payload-index/lowercase-full-text/_description.md

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+This code snippet demonstrates how to configure a full-text index for case-sensitive match support for a specified field in a collection. The index configuration includes details such as the field name, type (text), tokenizer (word), and whether to convert tokens to lowercase. Lowercasing is enabled by default, enabling case-sensitive matching. This setup disables lowercasing, enabling the filtering og points based on the presence of exact words in the field.

qdrant-landing/content/documentation/headless/snippets/create-payload-index/lowercase-full-text/http.md

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+```http
+PUT /collections/{collection_name}/index
+{
+    "field_name": "name_of_the_field_to_index",
+    "field_schema": {
+        "type": "text",
+        "tokenizer": "word",
+        "lowercase": false
+    }
+}
+```

qdrant-landing/content/documentation/headless/snippets/create-payload-index/lowercase-full-text/typescript.md

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+```typescript
+import { QdrantClient } from "@qdrant/js-client-rest";
+
+const client = new QdrantClient({ host: "localhost", port: 6333 });
+
+client.createPayloadIndex("{collection_name}", {
+  field_name: "name_of_the_field_to_index",
+  field_schema: {
+    type: "text",
+    tokenizer: "word",
+    lowercase: false,
+  },
+});
+```