Update string-functions.md

docs/en/sql-reference/functions/string-functions.md

@@ -495,25 +495,23 @@ If the ‘s’ string is non-empty and does not contain the ‘c’ character at
 
 Returns the string ‘s’ that was converted from the encoding in ‘from’ to the encoding in ‘to’.
 
-## base58Encode(plaintext), base58Decode(encoded_text)
+## base58Encode(plaintext)
 
-Accepts a String and encodes/decodes it using [Base58](https://tools.ietf.org/id/draft-msporny-base58-01.html) encoding scheme using "Bitcoin" alphabet.
+Accepts a String and encodes it using [Base58](https://tools.ietf.org/id/draft-msporny-base58-01.html) encoding scheme using "Bitcoin" alphabet.
 
 **Syntax**
 
 ```sql
-base58Encode(decoded)
+base58Encode(plaintext)
-base58Decode(encoded)
 ```
 
 **Arguments**
 
-- `decoded` — [String](../../sql-reference/data-types/string.md) column or constant.
+- `plaintext` — [String](../../sql-reference/data-types/string.md) column or constant.
-- `encoded` — [String](../../sql-reference/data-types/string.md) column or constant. If the string is not a valid base58-encoded value, an exception is thrown.
 
 **Returned value**
 
--   A string containing encoded/decoded value of 1st argument.
+-   A string containing encoded value of 1st argument.
 
 Type: [String](../../sql-reference/data-types/string.md).
 
@@ -523,17 +521,48 @@ Query:
 
 ``` sql
 SELECT base58Encode('Encoded');
+```
+
+Result:
+```text
+┌─base58Encode('Encoded')─┐
+│ 3dc8KtHrwM              │
+└─────────────────────────┘
+```
+
+## base58Decode(encoded_text)
+
+Accepts a String and decodes it using [Base58](https://tools.ietf.org/id/draft-msporny-base58-01.html) encoding scheme using "Bitcoin" alphabet.
+
+**Syntax**
+
+```sql
+base58Decode(encoded_text)
+```
+
+**Arguments**
+
+- `encoded_text` — [String](../../sql-reference/data-types/string.md) column or constant. If the string is not a valid base58-encoded value, an exception is thrown.
+
+**Returned value**
+
+-   A string containing decoded value of 1st argument.
+
+Type: [String](../../sql-reference/data-types/string.md).
+
+**Example**
+
+Query:
+
+``` sql
 SELECT base58Decode('3dc8KtHrwM');
 ```
 
 Result:
 ```text
-┌─encodeBase58('Encoded')─┐
+┌─base58Decode('3dc8KtHrwM')─┐
-│ 3dc8KtHrwM                         │
-└──────────────────────────────────┘
-┌─decodeBase58('3dc8KtHrwM')─┐
 │ Encoded                    │
-└────────────────────────────────────┘
+└────────────────────────────┘
 ```
 
 ## base64Encode(s)