Fixed confusing use of thenReturn in code example (#1263)
Fixed confusing use of thenReturn in code example (#1263)

Replaced the confusing use of the legacy .thenReturn() in the last code example with the expected .return() instead.
HBOCodeLabs/bluebird,petkaantonov/bluebird,HBOCodeLabs/bluebird,HBOCodeLabs/bluebird,petkaantonov/bluebird,petkaantonov/bluebird