fix(mdc-list): invalid syntax in generated .d.ts bundle
fix(mdc-list): invalid syntax in generated .d.ts bundle

An earlier commit added a doc string with an `@return` in it (5d060518804437aa1ae3152562f1bb78b1af4aa6). By itself this isn't wrong, but it seems to hit a buggy code path in `dts-bundle` which causes it not to close a comment and to produce an invalid .d.ts file.

These changes work around the issue by using `@returns` instead. A longer term solution would be to move away from `dts-bundle` since it doesn't appear to be maintained.

material-components/material-components-web,material-components/material-components-web,material-components/material-components-web