Remove JSDoc comments

**what is the change?:**
removing some comments

**why make this change?:**
The code is basically self explanatory and these comments could get out
of sync.

**test plan:**
Visual inspection, `yarn build` and `yarn test`

**issue:**
facebook#9398

scripts/rollup/build.js

@@ -194,15 +194,6 @@ function getFilename(name, hasteName, bundleType) {
   }
 }
 
-/**
- * @param configs {
- *  mangle,
- *  manglePropertiesOnProd,
- *  preserveVersionHeader,
- *  removeComments,
- *  headerSanityCheck,
- * }
- */
 function uglifyConfig(configs) {
   var mangle = configs.mangle;
   var manglePropertiesOnProd = configs.manglePropertiesOnProd;