remove ignored macro tests

we need to significantly reengineer macros, so the tests as they exist
are useless

crates/ra_ide_api/src/mock_analysis.rs

@@ -18,7 +18,7 @@ impl MockAnalysis {
     }
     /// Creates `MockAnalysis` using a fixture data in the following format:
     ///
-    /// ```rust,ignore
+    /// ```not_rust
     /// //- /main.rs
     /// mod foo;
     /// fn main() {}