Update comments on rust support in init-action

Clarify comments regarding rust support in codeql versions

Author: redsun82

src/init-action.ts

@@ -632,7 +632,8 @@ async function run() {
     // For rust, if `codeql` does not support it, we are in two possible situations:
     // * either we run `codeql` prior to 2.19.3, which means no rust support is possible
     // * or we run a version between 2.19.3 and 2.22.1 (excluded), when rust support was
-    //   experimental and required explicitly setting CODEQL_ENABLE_EXPERIMENTAL_FEATURES
+    //   experimental and required explicitly setting CODEQL_ENABLE_EXPERIMENTAL_FEATURES,
+    //   and that env variable is not set
     // However, there is no need to let users know about the experimental feature flag at
     // this point, if they want rust support they should chose a version which supports it
     // publicly.