Proofread some code/docs

[nyurik]

Possible TODOs (not blocking):

• [x] I wasn't sure if escapeable should be replaced by escapable -- too many occurrences to replace
• [x] determinizing is another weird one
• [x] There are some "Padron" -- is that intentional?

[nyurik]

Ok, i fixed them all, with the exception of pub fn is_escapeable_character(...) -- I will submit another PR for that with a obsolete fn