Fix DuckDuckGo example in README.md

[asashour]

This proposed a fix, as the current example is failing, due to having many inputs, and due to the the placeholder string.

[badeball]

If changed, I'd rather that the code examples in markdown conforms with any of the many examples (which are all tested in CI), EG. this one. Furthermore, any other instances should be changed accordingly, such as in quick-start.md.