45111: zshmisc(1): Clarify the documentation of 'return' and 'exit' in conjunction with try/always

Having reviewed 20076, 20084, 21734, and 21735, my understanding is that
the original intention was:

- A 'return' in a function does run always-list
- An 'exit' outside a function does not run always-list
- A 'return' outside a function is treated as an 'exit'

All of which are the case today.  The remaining case, of 'exit' used
inside a function, was not specified by the referenced -workers@ posts;
does, as implemented, run the always-list; and furthermore, based in
21734 it's fair to assume that the original documentation was assuming
that 'exit' would be used outside of any function, just like it assumed
'return' would be used inside a function.

Therefore, have the documentation specify only the behaviour of 'exit'
outside any function, and leave the behaviour of 'exit' inside
a function unspecified.  Anyone who relied on the documentation of 'exit'
as documented until this commit would have run into the
documentation/implementation discrepancy described in 45075.

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