Function name formatting

Co-authored-by: Bogdan Pintea <[email protected]>

x-pack/plugin/esql-core/src/main/java/org/elasticsearch/xpack/esql/core/type/DataType.java

@@ -86,7 +86,7 @@
  *     sorting and the other binary comparisons. Make sure these functions all
  *     have CSV tests that run against indexed data.</li>
  *     <li>Add conversion functions as appropriate.  Almost all types should
- *     support TO_STRING, and should have a TO_TYPE function that accepts a
+ *     support ToString, and should have a "ToType" function that accepts a
  *     string.  There may be other logical conversions depending on the nature
  *     of the type. Make sure to add the conversion function to the
  *     TYPE_TO_CONVERSION_FUNCTION map in EsqlDataTypeConverter. Make sure the