Align IntroToRx Start description with reality #2163
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Fixes #2162
The IntroToRx book incorrectly describes
Observable.Startas offering "lazy" evaluation. In fact, it invariably schedules the work for immediate execution (or as near to immediate as your chosen scheduler can manage). The distinguishing feature ofStartis that it doesn't matter if it takes a long time for this work to complete. (So unlikeReturn, where you need to have the value in hand before you can get it wrapped in anIObservable<T>,Startreturns anIObservable<T>immediately. The callback can take as long as it likes, and the value will become available to observers once the callback completes.)This change updates the relevant text to describe
Starts behaviour correctly.