docs: document existential operator assignment - #5502
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CoffeeScript allows ?. in assignment targets, unlike JS optional chaining. Document this in the Existential Operator section with an example and table row. Fixes jashkenas#5446
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Summary
?./?[]) can appear on the left-hand side of an assignment, which differs from JavaScript optional chaining.Fixes #5446
Test plan
soak_assignmentexample compiles as shown (el?.href = 'b'only assigns whenel != null)