Multi-words synonyms doc

Author: speedblue

README.md

@@ -580,7 +580,7 @@ You can decide to have the same priority for two attributes by passing them in t
  * **allowCompressionOfIntegerArray**: Allows compression of big integer arrays. We recommended enabling this feature and then storing the list of user IDs or rights as an integer array. When enabled, the integer array is reordered to reach a better compression ratio. Defaults to false.
 
 #### Query expansion
- * **synonyms**: (array of array of words considered as equals). For example, you may want to retrieve the **black ipad** record when your users are searching for **dark ipad**, even if the word **dark** is not part of the record. To do this, you need to configure **black** as a synonym of **dark**. For example, `"synomyms": [ [ "black", "dark" ], [ "small", "little", "mini" ], ... ]`.
+ * **synonyms**: (array of array of string considered as equals). For example, you may want to retrieve the **black ipad** record when your users are searching for **dark ipad**, even if the word **dark** is not part of the record. To do this, you need to configure **black** as a synonym of **dark**. For example, `"synomyms": [ [ "black", "dark" ], [ "small", "little", "mini" ], ... ]`. Synonym feature also supports multi-words expression like `"synonyms": [ ["NY", "New York"] ]`
  * **placeholders**: (hash of array of words). This is an advanced use case to define a token substitutable by a list of words without having the original token searchable. It is defined by a hash associating placeholders to lists of substitutable words. For example, `"placeholders": { "<streetnumber>": ["1", "2", "3", ..., "9999"]}` would allow it to be able to match all street numbers. We use the `< >` tag syntax to define placeholders in an attribute. For example:
   * Push a record with the placeholder: `{ "name" : "Apple Store", "address" : "&lt;streetnumber&gt; Opera street, Paris" }`.
   * Configure the placeholder in your index settings: `"placeholders": { "<streetnumber>" : ["1", "2", "3", "4", "5", ... ], ... }`.