chore: remove yarn reference

close #6709

packages/reactivity/README.md

@@ -4,7 +4,7 @@
 
 This package is inlined into Global & Browser ESM builds of user-facing renderers (e.g. `@vue/runtime-dom`), but also published as a package that can be used standalone. The standalone build should not be used alongside a pre-bundled build of a user-facing renderer, as they will have different internal storage for reactivity connections. A user-facing renderer should re-export all APIs from this package.
 
-For full exposed APIs, see `src/index.ts`. You can also run `yarn build reactivity --types` from repo root, which will generate an API report at `temp/reactivity.api.md`.
+For full exposed APIs, see `src/index.ts`. You can also run `pnpm build reactivity --types` from repo root, which will generate an API report at `temp/reactivity.api.md`.
 
 ## Credits
 

packages/runtime-core/README.md

@@ -2,18 +2,18 @@
 
 > This package is published only for typing and building custom renderers. It is NOT meant to be used in applications.
 
-For full exposed APIs, see `src/index.ts`. You can also run `yarn build runtime-core --types` from repo root, which will generate an API report at `temp/runtime-core.api.md`.
+For full exposed APIs, see `src/index.ts`. You can also run `pnpm build runtime-core --types` from repo root, which will generate an API report at `temp/runtime-core.api.md`.
 
 ## Building a Custom Renderer
 
-``` ts
+```ts
 import { createRenderer } from '@vue/runtime-core'
 
 const { render, createApp } = createRenderer({
   patchProp,
   insert,
   remove,
-  createElement,
+  createElement
   // ...
 })