Comment fixed as suggested

Bug:
Change-Id: Id8fed7b826d54ca122d1c4d66fb530b54d2536fc
diff --git a/src/main/java/com/android/tools/r8/ir/desugar/StringConcatRewriter.java b/src/main/java/com/android/tools/r8/ir/desugar/StringConcatRewriter.java
index 9d34e80..525310a 100644
--- a/src/main/java/com/android/tools/r8/ir/desugar/StringConcatRewriter.java
+++ b/src/main/java/com/android/tools/r8/ir/desugar/StringConcatRewriter.java
@@ -175,9 +175,9 @@
    * to be inserted into a template string `recipe`.
    *
    * NOTE: `makeConcat​WithConstants` also supports passing compilation time `constants`
-   * as bootstrap method arguments, but it does not seem to be used in current Java 9
-   * compiler. This method does not support desugaring of cases with such bootstrap method
-   * arguments are provided.
+   * as bootstrap method arguments, but current version seems to only support String
+   * constants. This method does not support desugaring of `makeConcatWithConstants`
+   * with non-string constants provided as bootstrap method arguments.
    */
   private void rewriteMakeConcatWithConstants(
       DexMethod method, IRCode code, ListIterator<BasicBlock> blocks,