chore: remove repetitive word (hyperledger#6971)

Signed-off-by: goodactive <goodactive@qq.com>
Co-authored-by: Sally MacFarlane <macfarla.github@gmail.com>

testutil/src/main/java/org/hyperledger/besu/testutil/JsonTestParameters.java

@@ -133,7 +133,7 @@ public interface Generator<S, T> {
   // The type to which the json file is directly mapped
   private final Class<S> jsonFileMappedType;
 
-  // The final type of the test case spec, which may or may not not be same than jsonFileMappedType
+  // The final type of the test case spec, which may or may not be same than jsonFileMappedType
   // Note that we don't really use this field as of now, but as this is the actual type of the final
   // spec used by tests, it feels "right" to have it passed explicitly at construction and having it
   // around could prove useful later.