docs: add missing code block language to README.md (#10952)

Author: マルコメ

examples/README.md

@@ -4,21 +4,21 @@ This website is built using [Docusaurus](https://docusaurus.io/), a modern stati
 
 ### Installation
 
-```
+```bash
 $ yarn
 ```
 
 ### Local Development
 
-```
+```bash
 $ yarn start
 ```
 
 This command starts a local development server and opens up a browser window. Most changes are reflected live without having to restart the server.
 
 ### Build
 
-```
+```bash
 $ yarn build
 ```
 
@@ -28,13 +28,13 @@ This command generates static content into the `build` directory and can be serv
 
 Using SSH:
 
-```
+```bash
 $ USE_SSH=true yarn deploy
 ```
 
 Not using SSH:
 
-```
+```bash
 $ GIT_USER=<Your GitHub username> yarn deploy
 ```
 

examples/classic-typescript/README.md

@@ -13,7 +13,7 @@ Please help us provide exhaustive translations:
 
 After updating the theme code, you can "synchronize" the translations by running:
 
-```
+```bash
 yarn workspace @docusaurus/theme-translations update
 ```
 

examples/classic/README.md

@@ -4,7 +4,7 @@ Low Quality Image Placeholders (LQIP) loader for webpack.
 
 ## Installation
 
-```
+```bash
 npm install --save-dev @docusaurus/lqip-loader
 ```