lexical scoping
Update Functions.rmd
lexical scoping II

I think this better captures the gist of what you said. 

Also, while I haven't seen any in the book, I think the edited "'lexical' in lexical" paragraph might now work better as a footnote.
Lexical scoping looks up symbol values

original verb tenses make better sense
Merge pull request #201 from lindbrook/patch-29

lexical scoping