chore: fixes a small typo and prettifies the document (#778)

.github/contributing.md

@@ -19,10 +19,12 @@ Hi! I'm really excited that you are interested in contributing to Vue.js. Before
 - Checkout a topic branch from a base branch, e.g. `master`, and merge back against that branch.
 
 - If adding a new feature:
+
   - Add accompanying test case.
   - Provide a convincing reason to add this feature. Ideally, you should open a suggestion issue first and have it approved before working on it.
 
 - If fixing bug:
+
   - If you are resolving a special issue, add `(fix #xxxx[,#xxxx])` (#xxxx is the issue id) in your PR title for a better release log, e.g. `update entities encoding/decoding (fix #3899)`.
   - Provide a detailed description of the bug in the PR. Live demo preferred.
   - Add appropriate test coverage if applicable. You can check the coverage of your code addition by running `yarn test --coverage`.
@@ -73,10 +75,12 @@ yarn build runtime --all
 By default, each package will be built in multiple distribution formats as specified in the `buildOptions.formats` field in its `package.json`. These can be overwritten via the `-f` flag. The following formats are supported:
 
 - **`global`**:
+
   - For direct use via `<script>` in the browser. The global variable exposed is specified via the `buildOptions.name` field in a package's `package.json`.
   - Note: global builds are not [UMD](https://github.com/umdjs/umd) builds. Instead they are built as [IIFEs](https://developer.mozilla.org/en-US/docs/Glossary/IIFE).
 
 - **`esm-bundler`**:
+
   - Leaves prod/dev branches with `process.env.NODE_ENV` guards (to be replaced by bundler)
   - Does not ship a minified build (to be done together with the rest of the code after bundling)
   - For use with bundlers like `webpack`, `rollup` and `parcel`.
@@ -85,6 +89,7 @@ By default, each package will be built in multiple distribution formats as speci
     - This means you **can** install/import these deps without ending up with different instances of these dependencies
 
 - **`esm`**:
+
   - For usage via native ES modules imports (in browser via `<script type="module">`, or via Node.js native ES modules support in the future)
   - Inlines all dependencies - i.e. it's a single ES module with no imports from other files
     - This means you **must** import everything from this file and this file only to ensure you are getting the same instance of code.
@@ -114,7 +119,7 @@ Use the `--sourcemap` or `-s` flag to build with source maps. Note this will mak
 
 The `--types` or `-t` flag will generate type declarations during the build and in addition:
 
-- Roll the declarations into a single `.dts` file for each package;
+- Roll the declarations into a single `.d.ts` file for each package;
 - Generate an API report in `<projectRoot>/temp/<packageName>.api.md`. This report contains potential warnings emitted by [api-extractor](https://api-extractor.com/).
 - Generate an API model json in `<projectRoot>/temp/<packageName>.api.json`. This file can be used to generate a Markdown version of the exported APIs.
 
@@ -186,7 +191,9 @@ This repository employs a [monorepo](https://en.wikipedia.org/wiki/Monorepo) set
 
     ```ts
     import { foo } from '@vue/shared'
-    export const publicFoo = foo as { /* re-define type */ }
+    export const publicFoo = foo as {
+      /* re-define type */
+    }
     ```
 
 - `vue`: The public facing "full build" which includes both the runtime AND the compiler.
@@ -208,7 +215,6 @@ This is made possible via several configurations:
 ### Package Dependencies
 
 ```
-
                                     +---------------------+
                                     |                     |
                                     |  @vue/compiler-sfc  |