Disable doctests for all libraries

We don't use them, and they add a lot of noise to the test output
when running all tests in the workspace.

crates/go_to_line/Cargo.toml

@@ -5,6 +5,7 @@ edition = "2021"
 
 [lib]
 path = "src/go_to_line.rs"
+doctest = false
 
 [dependencies]
 text = { path = "../text" }