search for @singleton should turn up something in the docs

**I'm submitting a bug report**
- **Browser:**
all

**Current behavior:**
entering "@singleton" in the documentation search box turns up nothing.

**Expected/desired behavior:**
should turn up documentation about that decoration. same with @transient, etc.

Start with the documentation search box and trace how its index handles symbols such as @singleton and @transient. Confirm the current search behavior, then verify that searches for those decorators return the relevant documentation.

Written by the indexing model from the issue text.