Fix curl example in the Specifying facet fields section

[tylere]

Overview

What is the feature/fix?

Fix curl example in the Specifying facet fields section.

What is the Solution?

remove duplicate "/search" from url string.

What areas of the application does this impact?

The public docs.

Checklist

• I have updated/added unit and integration tests that prove my fix is effective or that my feature works
• New and existing unit and int tests pass locally and remotely with my changes
• I have removed unnecessary/dead code and imports in files I have changed
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings