Update docs

Author: rschu1ze

docs/en/sql-reference/functions/splitting-merging-functions.md

@@ -353,7 +353,8 @@ Result:
 
 
 Splits a UTF-8 string into n-grams of `ngramsize` symbols.
-This function is deprecated. Prefer to use [tokens](#tokens) with the `ngram` tokenizer. The function will be removed at some point in future.
+This function is deprecated. Prefer to use [tokens](#tokens) with the `ngram` tokenizer.
+The function might be removed at some point in future.
 
 **Syntax**
 
@@ -392,7 +393,7 @@ The default tokenizer uses non-alphanumeric ASCII characters as separators.
 **Arguments**
 
 - `value` — The input string. [String](../data-types/string.md) or [FixedString](../data-types/fixedstring.md).
-- `tokenizer` — The tokenizer to use. Valid arguments are `default`, `noop`, and `ngram`.
+- `tokenizer` — The tokenizer to use. Valid arguments are `default`, `ngram`, and `noop`. Optional, if not set explicitly, defaults to `default`. [const String](../data-types/string.md)
 - `ngrams` — Only relevant if argument `tokenizer` is `ngram`: An optional parameter which defines the length of the ngrams. If not set explicitly, defaults to `3`. [UInt8](../data-types/int-uint.md).
 
 **Returned value**