Rename some Diagnostic setters.

`Diagnostic` has 40 methods that return `&mut Self` and could be
considered setters. Four of them have a `set_` prefix. This doesn't seem
necessary for a type that implements the builder pattern. This commit
removes the `set_` prefixes on those four methods.

compiler/rustc_symbol_mangling/src/errors.rs

@@ -19,7 +19,7 @@ impl<G: EmissionGuarantee> IntoDiagnostic<'_, G> for TestOutput {
 
         #[allow(rustc::untranslatable_diagnostic)]
         let mut diag = DiagnosticBuilder::new(dcx, level, format!("{kind}({content})"));
-        diag.set_span(span);
+        diag.span(span);
         diag
     }
 }