Use CJS syntax in documentation

Out of the box, ESM syntax will only work in Node.js 13, so having that
as the default example is misleading.

Author: novemberborn

docs/rules/assertion-arguments.md

@@ -9,7 +9,7 @@ Assertion messages are optional arguments that can be given to any assertion cal
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test(t => {
 	t.is(value); // Not enough arguments
@@ -31,7 +31,7 @@ test(t => {
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test(t => {
 	t.is(value, expected);

docs/rules/hooks-order.md

@@ -18,7 +18,7 @@ This rule is fixable as long as no other code is between the hooks that need to
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test.after(t => {
 	doFoo();
@@ -34,7 +34,7 @@ test('foo', t => {
 ```
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => {
 	t.true(true);
@@ -49,7 +49,7 @@ test.before(t => {
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test.before(t => {
 	doFoo();

docs/rules/max-asserts.md

@@ -11,7 +11,7 @@ Skipped assertions are counted.
 
 ```js
 /*eslint ava/max-asserts: ["error", 5]*/
-import test from 'ava';
+const test = require('ava');
 
 test('getSomeObject should define the players\' names', t => {
 	const object = lib.getSomeObject();
@@ -30,7 +30,7 @@ test('getSomeObject should define the players\' names', t => {
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test('getSomeObject should define the player\'s name', t => {
 	const object = lib.getSomeObject();

docs/rules/no-async-fn-without-await.md

@@ -12,7 +12,7 @@ This rule will report an error when it finds an async test which does not use th
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test(async t => {
 	return foo().then(res => {
@@ -25,7 +25,7 @@ test(async t => {
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test(async t => {
 	t.is(await foo(), 1);

docs/rules/no-cb-test.md

@@ -8,7 +8,7 @@ Disallow the use of `test.cb()`. We instead recommend using `test()` with an asy
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test.cb('some test', t => {
 	t.pass();
@@ -20,7 +20,7 @@ test.cb('some test', t => {
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test('some test', async t => {
 	t.pass();

docs/rules/no-duplicate-modifiers.md

@@ -8,7 +8,7 @@ Prevent the use of duplicate [test modifiers](https://github.com/avajs/ava/blob/
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test.only.only(t => {});
 test.serial.serial(t => {});
@@ -21,7 +21,7 @@ test.only.only.cb(t => {});
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test.only(t => {});
 test.serial(t => {});

docs/rules/no-identical-title.md

@@ -8,7 +8,7 @@ Disallow tests with identical titles as it makes it hard to differentiate them.
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => {
 	t.pass();
@@ -23,7 +23,7 @@ test('foo', t => {
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test(t => {
 	t.pass();

docs/rules/no-ignored-test-files.md

@@ -10,15 +10,15 @@ This rule will verify that files which create tests are treated as test files by
 ```js
 // File: test/_helper.js
 // Invalid because a helper.
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => {
 	t.pass();
 });
 
 // File: lib/foo.js
 // Invalid because not a test file.
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => {
 	t.pass();
@@ -30,7 +30,7 @@ test('foo', t => {
 
 ```js
 // File: test/foo.js
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => {
 	t.pass();

docs/rules/no-import-test-files.md

@@ -10,13 +10,13 @@ This rule will verify that you don't import any test files. It will consider the
 ```js
 // File: src/index.js
 // Invalid because *.test.js is considered as a test file.
-import tests from './index.test.js';
+const tests = require('./index.test.js');
 ```
 
 ```js
 // File: src/index.js
 // Invalid because any files inside __tests__ are considered test files
-import tests from './__tests__/index.js';
+const tests = require('./__tests__/index.js');
 
 test('foo', t => {
 	t.pass();
@@ -28,13 +28,13 @@ test('foo', t => {
 
 ```js
 // File: src/index.js
-import sinon from 'sinon';
+const sinon = require('sinon');
 
 ```
 
 ```js
 // File: src/index.js
-import utils from './utils';
+const utils = require('./utils');
 ```
 
 ## Options

docs/rules/no-inline-assertions.md

@@ -10,7 +10,7 @@ This rule is fixable. It will wrap the assertion in braces `{}`. It will not do
 ## Fail
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => t.true(fn()));
 ```
@@ -19,7 +19,7 @@ test('foo', t => t.true(fn()));
 ## Pass
 
 ```js
-import test from 'ava';
+const test = require('ava');
 
 test('foo', t => {
 	t.true(fn());