Problem:
SequenceBuilder is experimental and deprecated in 1.3 in favor of
SequenceScope. Usage of experimental package is discouraged in 1.3.
The documentation for SequenceBuilder refers to SequnceScope sample code,
which might be confusing.
Solution:
Remove samples for SequenceBuilder completely to discourage its usage,
but provide a note about it having deprecated in favor of SequenceScope.
Provide links to modern version of outdated SequenceBuilder.
Mikhail Levchenko
16918fa25e