Fixed typo in "a saved entity" shared example.

Oops. That is all.

Or *almost* all; I have no idea why RSpec now reports 771 examples run
as compared to the previous 773. But the coverage report says we're
still good, and Issue 87 says the example count is a dubious number
that should be taken with a Gibraltar-sized grain of salt. Oh well.

RSpec: 771 examples, 0 failures (but see Issue #87)
RuboCop: 153 files inspected, no offenses detected