doc: update the recommended placeholder

CHANGELOG.md

@@ -1,3 +1,7 @@
+# 1.5.1
+
+* Documentation improvements
+
 # 1.5.0
 
 * Make the `data` from an `ExpectFile` accessible ([#43])

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "expect-test"
-version = "1.5.0"
+version = "1.5.1"
 description = "Minimalistic snapshot testing library"
 keywords = ["snapshot", "testing", "expect"]
 categories = ["development-tools::testing"]

src/lib.rs

@@ -113,7 +113,7 @@
 //! # fn check(_: i32, _: Expect) {}
 //! #[test]
 //! fn test_division() {
-//!     check(92 / 2, expect![[]])
+//!     check(92 / 2, expect![[""]])
 //! }
 //! ```
 //!