fixup! add a comment explaining why

Author: alicewriteswrongs

scripts/esbuild/internal-platform-hydrate.ts

@@ -39,9 +39,6 @@ export async function getInternalPlatformHydrateBundles(opts: BuildOptions): Pro
 
   const internalHydrateAliases = getEsbuildAliases();
   internalHydrateAliases['@platform'] = hydratePlatformInput;
-
-  // the runtime imports from `@stencil/core/mock-doc/constants` so we don't
-  // want to have the existing alias around
   delete internalHydrateAliases['@stencil/core/mock-doc'];
 
   const internalHydratePlatformBundle: ESBuildOptions = {