fixes

xtask/src/codegen/gen_unstable_future_descriptor.rs

@@ -21,7 +21,7 @@ pub fn generate_unstable_future_descriptor(mode: Mode) -> Result<()> {
         .args(&["sparse-checkout", "set", "/src/doc/unstable-book/src/"])
         .output()?;
     Command::new("git").current_dir(path.clone()).args(&["pull", "origin", "master"]).output()?;
-    //TODO: check git, and do pull
+    //FIXME: check git, and do pull
 
     let src_dir = path.join("src/doc/unstable-book/src");
     let files = WalkDir::new(src_dir.join("language-features"))