Update yarn installation instructions (#469)

* Update yarn installation instructions

resolve #464

* Remove kind of weird yarn install rec from the official install docs that is not necessary and does not work

_partials/cn/yarn.md

@@ -3,9 +3,16 @@
 让我们一起来安装[`yarn`](https://classic.yarnpkg.com/en/docs/install):
 
 ```bash
-npm install --global yarn
+corepack enable
+yarn set version stable
 ```
 
+```bash
+exec zsh
+```
+
+⚠️ 如果你看到任何错误信息，请尝试运行 `npm install -g corepack` 然后再次运行上面的命令。
+
 重启终端并运行：
 
 ```bash

_partials/es/yarn.md

@@ -5,10 +5,16 @@
 En una terminal, ejecuta los siguientes comandos:
 
 ```bash
-npm install --global yarn
+corepack enable
+yarn set version stable
+```
+
+```bash
 exec zsh
 ```
 
+⚠️ Si ves algún mensaje de error, intenta ejecutar `npm install -g corepack` y luego vuelve a ejecutar los comandos anteriores.
+
 Luego ejecuta este comando:
 
 ```bash

_partials/fr/yarn.md

@@ -5,10 +5,16 @@
 Exécute les commandes suivantes dans le terminal :
 
 ```bash
-npm install --global yarn
+corepack enable
+yarn set version stable
+```
+
+```bash
 exec zsh
 ```
 
+⚠️ Si tu rencontres des messages d'erreur, essaye d'exécuter `npm install -g corepack` puis exécute à nouveau les commandes ci-dessus.
+
 Puis exécute la commande suivante :
 
 ```bash

_partials/pt/yarn.md

@@ -5,13 +5,16 @@
 Em um terminal, execute os seguintes comandos:
 
 ```bash
-npm install --global yarn
+corepack enable
+yarn set version stable
 ```
 
 ```bash
 exec zsh
 ```
 
+⚠️ Se vires quaisquer mensagens de erro, tenta executar `npm install -g corepack` e, em seguida, volta a executar os comandos acima.
+
 Em seguida, execute o seguinte comando:
 
 ```bash

_partials/yarn.md

@@ -5,9 +5,12 @@
 In a terminal, run the following commands:
 
 ```bash
-npm install --global yarn
+corepack enable
+yarn set version stable
 ```
 
+⚠️ If you see any error messages, try running `npm install -g corepack` and then run the commands above again.
+
 ```bash
 exec zsh
 ```