Update part5b.md

Remove duplicate rule in .eslintrs.cjs (react/prop-types)

Author: jacekpl

src/content/5/en/part5b.md

@@ -759,7 +759,6 @@ module.exports = {
         "error", { "before": true, "after": true }
     ],
     "no-console": 0,
-    "react/prop-types": 0,
     "react/react-in-jsx-scope": "off",
     "react/prop-types": 0,
     "no-unused-vars": 0