55470f7357 Change `create` to `construct` in rustdocs (Jamil Lambert, PhD)
Pull request description:
In preparation for units 1.0 address #3868 and make sure "constructs" is used instead of "creates" in rustdocs.
ACKs for top commit:
apoelstra:
ACK 55470f73571ce0e0279f5697a252695e8c8df9b5; successfully ran local tests; sure
tcharding:
ACK 55470f7357
Tree-SHA512: 48f9b6cedfca782e698eec4520885f35834582ed098a65b00ccdfa54167c91fe62405f90c9c1e72a671e72ac349af74ac12808ce9e0708799f43d86749590649