fix lint issues in codegen

Author: fredemmott

src/RequestParametersCodegenBuilder.hack

@@ -76,7 +76,7 @@ final class RequestParametersCodegenBuilder<T as RequestParametersBase>
       $param_shape[] = new CodegenShapeMember($param_spec->getName(), $type);
       $body
         ->ensureNewLine()
-        ->addf('"%s" => ', $param_spec->getName())
+        ->addf("'%s' => ", $param_spec->getName())
         ->addMultilineCall(
           \sprintf(
             '$p->get%s%s',

tests/examples/codegen/GetRequestExampleControllerParameters.php

@@ -5,7 +5,7 @@
  * To re-generate this file run vendor/hhvm/hacktest/bin/hacktest
  *
  *
- * @generated SignedSource<<0e9bf7c34daf198ab5439077c13199b2>>
+ * @generated SignedSource<<4722d2f3b9d8e55cf57f34427b0d9e85>>
  */
 namespace Facebook\HackRouter\CodeGen\Tests\Generated;