Correct one example (missing an assignment).
Improve language in "Passing Lambdas in Calls"
Revise arm-2.iteration wrt. 'discussion', and 'uncompleted call'

Also fix typos, remove some duplicated text.
Update arm-2.iteration metadata and index.
Merge pull request #24 from hlindberg/master

update arm-2.iteration to 0.2.1 in posted state