doc: remove whitespaces from markdown files (#1267)

CONTRIBUTING.md

@@ -15,7 +15,7 @@ possible.
   - `entc/load` - `entc` loader API for loading user schemas into a Go objects at runtime.
   - `entc/gen` - The actual code generation logic resides in this package (and its `templates` package).
   - `integration` - Integration tests for `entc`.
-  
+
 - `privacy` - Runtime code for [privacy layer](https://entgo.io/docs/privacy/).
 
 - `doc` - Documentation code for `entgo.io` (uses [Docusaurus](https://docusaurus.io)).

README.md

@@ -2,9 +2,9 @@
 
 [English](README.md) | [中文](README_zh.md)
 
-<img width="50%" 
+<img width="50%"
 align="right"
-style="display: block; margin:40px auto;" 
+style="display: block; margin:40px auto;"
 src="https://s3.eu-central-1.amazonaws.com/entgo.io/assets/gopher_graph.png"/>
 
 Simple, yet powerful entity framework for Go, that makes it easy to build and maintain applications
@@ -26,17 +26,17 @@ For proper installation using [Go modules], visit [entgo.io website][entgo insta
 ## Docs and Support
 The documentation for developing and using ent is available at: https://entgo.io
 
-For discussion and support, [open an issue](https://github.com/facebook/ent/issues/new/choose) or join our [channel](https://gophers.slack.com/archives/C01FMSQDT53) in the gophers Slack. 
+For discussion and support, [open an issue](https://github.com/facebook/ent/issues/new/choose) or join our [channel](https://gophers.slack.com/archives/C01FMSQDT53) in the gophers Slack.
 
 ## Join the ent Community
-In order to contribute to `ent`, see the [CONTRIBUTING](CONTRIBUTING.md) file for how to go get started.  
+In order to contribute to `ent`, see the [CONTRIBUTING](CONTRIBUTING.md) file for how to go get started.
 If your company or your product is using `ent`, please let us know by adding yourself to the [ent users page](https://github.com/facebook/ent/wiki/ent-users).
 
 ## About the Project
 The `ent` project was inspired by Ent, an entity framework we use internally. It is developed and maintained
 by [a8m](https://github.com/a8m) and [alexsn](https://github.com/alexsn)
 from the [Facebook Connectivity][fbc] team. It is used by multiple teams and projects in production,
-and the roadmap for its v1 release is described [here](https://github.com/facebook/ent/issues/46). 
+and the roadmap for its v1 release is described [here](https://github.com/facebook/ent/issues/46).
 Read more about the motivation of the project [here](https://entgo.io/blog/2019/10/03/introducing-ent).
 
 ## License

README_zh.md

@@ -2,9 +2,9 @@
 
 [English](README.md) | [中文](README_zh.md)
 
-<img width="50%" 
+<img width="50%"
 align="right"
-style="display: block; margin:40px auto;" 
+style="display: block; margin:40px auto;"
 src="https://s3.eu-central-1.amazonaws.com/entgo.io/assets/gopher_graph.png"/>
 
 ent是一个简单而又功能强大的Go语言实体框架，ent易于构建和维护应用程序与大数据模型。
@@ -25,15 +25,15 @@ go get entgo.io/ent/cmd/ent
 ## 文档和支持
 开发和使用ent的文档请参照： https://entgo.io
 
-如要讨论问题和支持, [创建一个issue](https://github.com/facebook/ent/issues/new/choose) 或者加入我们的Gopher Slack(Slack软件,类似于论坛)[讨论组](https://gophers.slack.com/archives/C01FMSQDT53)  
+如要讨论问题和支持, [创建一个issue](https://github.com/facebook/ent/issues/new/choose) 或者加入我们的Gopher Slack(Slack软件,类似于论坛)[讨论组](https://gophers.slack.com/archives/C01FMSQDT53)
 
 ## 加入 ent 社区
-如果你想为`ent`做出贡献, [贡献代码](CONTRIBUTING.md) 中写了如何做出自己的贡献  
+如果你想为`ent`做出贡献, [贡献代码](CONTRIBUTING.md) 中写了如何做出自己的贡献
 如果你的公司或者产品在使用`ent`，请让我们知道你已经加入 [ent 用户](https://github.com/facebook/ent/wiki/ent-users)
 
 ## 关于项目
 `ent` 项目灵感来自于Ent,Ent是一个facebook内部使用的一个实体框架项目. 它由 [Facebook Connectivity][fbc] 团队通过 [a8m](https://github.com/a8m) 和 [alexsn](https://github.com/alexsn) 开发和维护
-, 它被生产中的多个团队和项目使用。它的v1版本的路线图为 [版本的路线图](https://github.com/facebook/ent/issues/46). 
+, 它被生产中的多个团队和项目使用。它的v1版本的路线图为 [版本的路线图](https://github.com/facebook/ent/issues/46).
 关于项目更多的信息 [ent介绍](https://entgo.io/blog/2019/10/03/introducing-ent).
 
 ## 声明