Fix Cannot find name 'Node' error in types/visitor.d.ts

[r7kamura]

When I tried to use npm's @ruby/prism package in my TypeScript project, I encountered the following error in tsc:

$ npm run compile

> [email protected] compile
> npm run compile:tsc


> [email protected] compile:tsc
> tsc -b

server/node_modules/@ruby/prism/types/visitor.d.ts:15:17 - error TS2304: Cannot find name 'Node'.

15     visit(node: Node): void;
                   ~~~~

server/node_modules/@ruby/prism/types/visitor.d.ts:27:27 - error TS2304: Cannot find name 'Node'.

27     visitChildNodes(node: Node): void;
                             ~~~~


Found 2 errors.

After a little investigation, it appears that some type names described in jsdoc are incorrect. I changed this part locally from Node to nodes.Node and confirmed that this tsc compilation passes.