Document f_chomp

Author: aalmiray

docs/modules/reference/pages/name-templates.adoc

@@ -26,6 +26,7 @@ The following functions may be used to modify text:
 | f_checksum_sha384      | file checksum with the given algorithm
 | f_checksum_sha512      | file checksum with the given algorithm
 | f_chop                 | remove the last character from a String
+| f_chomp                | removes one newline from end of a String if it's there, otherwise leave it alone
 | f_dash                 | transforms `.` and `_` into `-`
 | f_delete_whitespace    | deletes all whitespaces from a String
 | f_escape_csv           | returns a String value for a CSV column enclosed in double quotes, if required