Clarify the scope of @set and @local

[fredrikekre]

This patch adds a clarification about the scope of the right hand sides of @set and @local right hand sides.

I had some code similar to

function f()
    x = foo()
    @tasks for i in 1:3
        @local y = bar(x)
        local x = baz()
    end
end

which looks like it wouldn't work because x in bar(x) would normally throw an UndefVarError.

[MasonProtter]

Great catch, LGTM.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.01%. Comparing base (cba9127) to head (2c6c0ea).
Report is 126 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
- Coverage   90.24%   86.01%   -4.23%     
==========================================
  Files           3        7       +4     
  Lines          82      572     +490     
==========================================
+ Hits           74      492     +418     
- Misses          8       80      +72     

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