Update splitting-merging-functions.md

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

@@ -232,32 +232,6 @@ SELECT alphaTokens('abca1abc');
 └─────────────────────────┘
 ```
 
-## tokens {#tokens}
-
-Splits a string into tokens using non-alphanumeric ASCII characters as separators.
-
-**Arguments**
-
--   `input_string` — The set of bytes. [String](../../sql-reference/data-types/string.md).
-
-**Returned value**
-
-Returns an array of tokens from input string.
-
-Type: [Array](../data-types/array.md).
-
-**Example**
-
-``` sql
-SELECT tokens('test1,;\\ test2,;\\ test3,;\\   test4') AS tokens;
-```
-
-``` text
-┌─tokens────────────────────────────┐
-│ ['test1','test2','test3','test4'] │
-└───────────────────────────────────┘
-```
-
 ## extractAllGroups(text, regexp) {#extractallgroups}
 
 Extracts all groups from non-overlapping substrings matched by a regular expression.
@@ -296,40 +270,3 @@ Result:
 │ [['abc','123'],['8','"hkl"']]                                         │
 └───────────────────────────────────────────────────────────────────────┘
 ```
-
-## ngrams {#ngrams}
-
-Splits the UTF-8 string into n-grams of `ngramsize` symbols.
-
-**Syntax** 
-
-``` sql
-ngrams(string, ngramsize)
-```
-
-**Arguments**
-
--   `string` — String. [String](../../sql-reference/data-types/string.md) or [FixedString](../../sql-reference/data-types/fixedstring.md).
--   `ngramsize` — The size of an n-gram. [UInt](../../sql-reference/data-types/int-uint.md).
-
-**Returned values**
-
--   Array with n-grams.
-
-Type: [Array](../../sql-reference/data-types/array.md)([FixedString](../../sql-reference/data-types/fixedstring.md)).
-
-**Example**
-
-Query:
-
-``` sql
-SELECT ngrams('ClickHouse', 3);
-```
-
-Result:
-
-``` text
-┌─ngrams('ClickHouse', 3)───────────────────────────┐
-│ ['Cli','lic','ick','ckH','kHo','Hou','ous','use'] │
-└───────────────────────────────────────────────────┘
-```