* Rename userdata to data Instead of saying "userdata", which is ambiguous and imprecise, say "instruction data" or "account data". Also, add `ProgramError::InvalidInstructionData` Fixes #2761
Building the Solana book
Install the book's dependnecies, build, and test the book:
$ ./build.sh
Run any Rust tests in the markdown:
$ make test
Render markdown as HTML:
$ make build
Render and view the book:
$ make open