[Rd] R_tryEval not properly documented in 'Writing R Extensions' (PR#9524)

[ellis at stat.harvard.edu]

Full_Name: Byron Ellis
Version: 2.4.1
OS: N/A
Submission from: (NULL) (75.55.126.10)


R_tryEval is implied to be in the public API by 'Embedding R in Other
Applications,' but not documented in 'Writing R Extensions.' This would seem to
be an oversight given the dependence of many applications including but not
limited to the official OS X GUI on this function.