message: Sanitize formatting in IdTableWithHashBuckets doc comment.
  Fixes list formatting and sanitizes words in angle brackets, which aren't rendered in the web doc:
  Follows the working formatting example of TextFileInitializer.
diff: @@ -688,19 +688,22 @@ class IdTableWithHashBuckets(LookupInterface):
  For example, if an instance of `IdTableWithHashBuckets` is initialized with a
  string-to-id table that maps:
  - - emerson -> 0
  - - lake -> 1
  - - palmer -> 2
  +
  + * `emerson -> 0`
  + * `lake -> 1`
  + * `palmer -> 2`
  The `IdTableWithHashBuckets` object will performs the following mapping:
  - - emerson -> 0
  - - lake -> 1
  - - palmer -> 2
  - - <other term> -> bucket id between 3 and 3 + num_oov_buckets - 1, calculated
  - by: hash(<term>) % num_oov_buckets + vocab_size
  -
  - If input_tensor is ["emerson", "lake", "palmer", "king", "crimson"],
  - the lookup result is [0, 1, 2, 4, 7]
  +
  + * `emerson -> 0`
  + * `lake -> 1`
  + * `palmer -> 2`
  + * `<other term> -> bucket_id`, where bucket_id will be between `3` and
  + `3 + num_oov_buckets - 1`, calculated by:
  + `hash(<term>) % num_oov_buckets + vocab_size`
  +
  + If input_tensor is `["emerson", "lake", "palmer", "king", "crimson"]`,
  + the lookup result is `[0, 1, 2, 4, 7]`.
  If `table` is None, only out-of-vocabulary buckets are used.
  