I think some modules are underdocumented.
I think some of the docs deserves a redo and at least these are missing:

• How to use the preallocated structs.
• Explanations around the traits/enums.
• Doing something with the fact that ffi is public but shows docs for the fuzzings functions.
• Fixing failed attempts to bold text (i.e. in the Context trait and in Error::InvalidTweak)
• Adding some explanation in the Secp256k1 struct about the different situation of different functions for different types of contexts (is there a way in rust docs to make it look a bit better?)