information about 'let' being unsable - slight modification

[eshwarne]

The line
When a Lexical Environment is created, a Function Declaration immediately becomes a ready-to-use function (unlike let, that is unusable till the declaration).
should probably be
When a Lexical Environment is created, a Function Declaration immediately becomes a ready-to-use function (unlike let, that is unusable till the initialization and declaration).

https://javascript.info/closure#step-2-function-declarations