docs(devs-infra): explain the principle, improve English (#2327)

Author: dandv

website/docs/getting-started/installation.md

@@ -5,7 +5,7 @@ title: Installation
 
 ### Dependencies
 
-You can install `ts-jest` and dependencies all at once with the following commands.
+You can install `ts-jest` and dependencies all at once with one of the following commands.
 
 #### NPM
 
@@ -26,7 +26,7 @@ yarn add --dev jest typescript ts-jest
 #### Creating
 
 By default Jest can run without any config files, but it will not compile `.ts` files.
-To make it transpile TypeScript with `ts-jest`, we will need to create a configuration file.
+To make it transpile TypeScript with `ts-jest`, we will need to create a configuration file that will tell Jest to use a `ts-jest` preset.
 
 `ts-jest` can create the configuration file for you automatically:
 
@@ -42,10 +42,10 @@ npx ts-jest config:init
 yarn ts-jest config:init
 ```
 
-This will create a basic Jest configuration file which will make Jest know about your `.ts` files and handle them correctly.
+This will create a basic Jest configuration file which will inform Jest about how to handle `.ts` files correctly.
 
 You can also use the `jest --init` command (prefixed with either `npx` or `yarn` depending on what you're using) to have more options related to Jest.
-However, answer `no` to the Jest question about whether or not to enable Typescript. Instead, add the line: `preset: "ts-jest"` to the `jest.config.js` file afterwards.
+However, answer `no` to the Jest question about whether or not to enable TypeScript. Instead, add the line: `preset: "ts-jest"` to the `jest.config.js` file afterwards.
 
 #### Customizing
 

website/versioned_docs/version-26.5/getting-started/installation.md

@@ -5,7 +5,7 @@ title: Installation
 
 ### Dependencies
 
-You can install `ts-jest` and dependencies all at once with the following commands.
+You can install `ts-jest` and dependencies all at once with one of the following commands.
 
 #### NPM
 
@@ -26,7 +26,7 @@ yarn add --dev jest typescript ts-jest
 #### Creating
 
 By default Jest can run without any config files, but it will not compile `.ts` files.
-To make it transpile TypeScript with `ts-jest`, we will need to create a configuration file.
+To make it transpile TypeScript with `ts-jest`, we will need to create a configuration file that will tell Jest to use a `ts-jest` preset.
 
 `ts-jest` can create the configuration file for you automatically:
 
@@ -42,10 +42,10 @@ npx ts-jest config:init
 yarn ts-jest config:init
 ```
 
-This will create a basic Jest configuration file which will make Jest know about your `.ts` files and handle them correctly.
+This will create a basic Jest configuration file which will inform Jest about how to handle `.ts` files correctly.
 
 You can also use the `jest --init` command (prefixed with either `npx` or `yarn` depending on what you're using) to have more options related to Jest.
-However, answer `no` to the Jest question about whether or not to enable Typescript. Instead, add the line: `preset: "ts-jest"` to the `jest.config.js` file afterwards.
+However, answer `no` to the Jest question about whether or not to enable TypeScript. Instead, add the line: `preset: "ts-jest"` to the `jest.config.js` file afterwards.
 
 #### Customizing