[move-compiler-v2] Update Move Book with Move 2 features

[brmataptos]

🐛 Feature Request

Let's list the needed features here and make sure they are not missed at launch.

See also #14036

Items to include

• assert! macro can take just 1 parameter 9see [move-compiler-v2] Fix #14329: Make code optional in assert!(cond, code) #14334.
• If PR [move-compiler-v2] fix issue 6922 by allowing type annotations for lambda parameters #14254 has landed, then note that lambda parameters can have explicit types if desired.
• Once PR [compiler-v2] More concise visibility declarations #14417 lands, then add note on new concise visibility syntax.
• Once PR [compiler-v2] Enable empty field list #14415 lands, then add note on new syntax for structs with no fields.

[vineethk]

Also,

• .. syntax (and its limitations),
• positional fields,
• vector and resource index