Update docs (#1252)

- Change link to documentation to v3.
- Add links to the v3 documentation in the rules for v3.
- format.

Author: ota-meshi

docs/README.md

@@ -9,8 +9,8 @@ Official ESLint plugin for Vue.js.
 This plugin allows us to check the `<template>` and `<script>` of `.vue` files with ESLint.
 
 - Finds syntax errors.
-- Finds the wrong use of [Vue.js Directives](https://vuejs.org/v2/api/#Directives).
-- Finds the violation for [Vue.js Style Guide](https://vuejs.org/v2/style-guide/).
+- Finds the wrong use of [Vue.js Directives](https://v3.vuejs.org/api/directives.html).
+- Finds the violation for [Vue.js Style Guide](https://v3.vuejs.org/style-guide/).
 
 ESLint editor integrations are useful to check your code in real-time.
 

docs/rules/array-bracket-spacing.md

@@ -11,7 +11,7 @@ description: enforce consistent spacing inside array brackets
 
 This rule is the same rule as core [array-bracket-spacing] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [array-bracket-spacing]
 

docs/rules/arrow-spacing.md

@@ -11,7 +11,7 @@ description: enforce consistent spacing before and after the arrow in arrow func
 
 This rule is the same rule as core [arrow-spacing] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [arrow-spacing]
 

docs/rules/attributes-order.md

@@ -12,7 +12,7 @@ description: enforce order of attributes
 
 ## :book: Rule Details
 
-This rule aims to enforce ordering of component attributes. The default order is specified in the [Vue styleguide](https://vuejs.org/v2/style-guide/#Element-attribute-order-recommended) and is:
+This rule aims to enforce ordering of component attributes. The default order is specified in the [Vue styleguide](https://v3.vuejs.org/style-guide/#element-attribute-order-recommended) and is:
 
 - `DEFINITION`
   e.g. 'is'
@@ -215,9 +215,10 @@ This rule aims to enforce ordering of component attributes. The default order is
 
 </eslint-code-block>
 
-## :books: Further reading
+## :books: Further Reading
 
-- [Style guide - Element attribute order](https://vuejs.org/v2/style-guide/#Element-attribute-order-recommended)
+- [Style guide - Element attribute order](https://v3.vuejs.org/style-guide/#element-attribute-order-recommended)
+- [Style guide (for v2) - Element attribute order](https://vuejs.org/v2/style-guide/#Element-attribute-order-recommended)
 
 ## :mag: Implementation
 

docs/rules/block-spacing.md

@@ -11,7 +11,7 @@ description: disallow or enforce spaces inside of blocks after opening block and
 
 This rule is the same rule as core [block-spacing] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [block-spacing]
 

docs/rules/brace-style.md

@@ -11,7 +11,7 @@ description: enforce consistent brace style for blocks
 
 This rule is the same rule as core [brace-style] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [brace-style]
 

docs/rules/camelcase.md

@@ -9,7 +9,7 @@ description: enforce camelcase naming convention
 
 This rule is the same rule as core [camelcase] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [camelcase]
 

docs/rules/comma-dangle.md

@@ -11,7 +11,7 @@ description: require or disallow trailing commas
 
 This rule is the same rule as core [comma-dangle] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [comma-dangle]
 

docs/rules/comma-spacing.md

@@ -11,7 +11,7 @@ description: enforce consistent spacing before and after commas
 
 This rule is the same rule as core [comma-spacing] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [comma-spacing]
 

docs/rules/comma-style.md

@@ -11,7 +11,7 @@ description: enforce consistent comma style
 
 This rule is the same rule as core [comma-style] rule but it applies to the expressions in `<template>`.
 
-## :books: Further reading
+## :books: Further Reading
 
 - [comma-style]