Fix typo in Xtask CI (#1526)

 I think there was a typo here. If this is not a typo and I misunderstood the comment please just ignore this PR.

Author: lambdagolem

tools/ci/src/main.rs

@@ -1,7 +1,7 @@
 use xshell::cmd;
 
 fn main() {
-    // When run locally, results may from actual CI runs triggered by .github/workflows/ci.yml
+    // When run locally, results may differ from actual CI runs triggered by .github/workflows/ci.yml
     // - Official CI runs latest stable
     // - Local runs use whatever the default Rust is locally