Some typos fixed in programming.tex
Merge branch 'develop' of https://github.com/stan-dev/stan into feature/issue-668-next-manual
release candidate for 2.4 manual, completes issue #668
Some typo fixes for 2.4 manual
Merge pull request #770 from stan-dev/feature/issue-668-next-manual

Fixes #668. Feature/issue 668 next manual