update docs

docs/manual.en.md

@@ -2619,10 +2619,10 @@ Performs a linear search in table `a` for value `v`. `array_field_search` assume
 function in_list(s, v)
 ```
 
-### find_next_line
-
 Checks whether string `v` is included in a comma-separated list of strings `s`. For example, `abc` is included in the list `xyz,abc,12345`.
 
+### find_next_line
+
 ```
 function find_next_line(s, pos)
 ```

docs/manual.md

@@ -2784,10 +2784,10 @@ function array_field_search(a, f, v)
 function in_list(s, v)
 ```
 
-### find_next_line
-
 Включена ли строка v в список строк через запятую s. Например, `abc` включено в список `xyz,abc,12345`.
 
+### find_next_line
+
 ```
 function find_next_line(s, pos)
 ```