doc: fix incorrect type name in read_record docs

What appears to be the wrong enum (probably copy/paste edit miss).

PR #191

csv-core/src/reader.rs

@@ -565,8 +565,8 @@ impl Reader {
  /// `ReadRecordResult`, tells the caller what to do next. For example, if
  /// the entire input was read or if the output buffer was filled before a
  /// full field had been read, then `ReadRecordResult::InputEmpty` or
- /// `ReadFieldResult::OutputFull` is returned, respectively. Similarly, if
- /// the `ends` buffer is full, then `ReadFieldResult::OutputEndsFull` is
+ /// `ReadRecordResult::OutputFull` is returned, respectively. Similarly, if
+ /// the `ends` buffer is full, then `ReadRecordResult::OutputEndsFull` is
  /// returned. See the documentation for `ReadRecordResult` for more
  /// details.
  ///