Update Game.market.deal documentation

[MatthewGlancy]

Brief Description

I use typed screeps as a helper in my own codebase to get autocomplete via vs code from default JS. I noticed that Game.market.deal had some slight differences compared to the official docs. Had a misleading targetRoomName, when it should be yourRoomName and I've added some documentation for the parameters (paraphrasing from official docs)

Checklists

• Test passed
• Coding style (indentation, etc)
• Edits have been made to src/ files not index.d.ts
• Run npm run dtslint to update index.d.ts

[DiamondMofeng]

Thank you ❤️