docs: fix typo in style imports

[MaikoTan]

Since we have styles rather than style in the exports map in package.json

leches/package.json

Lines 16 to 23 in 428248a

	"exports": {
	".": {
	"types": "./dist/index.d.ts",
	"import": "./dist/tresleches.js"
	},
	"./styles": "./dist/style.css",
	"./*": "./*"
	},

[MaikoTan]

Close due to duplicate with #100 , sorry for harass.