Enhance examples

Author: axelrindle

docs/examples/01-basic/async.md

@@ -2,7 +2,7 @@
 
 The future is now! Futuristic approach leveraging top-level await.
 
-```js
+```js showLineNumbers title="src/util/version-check.js"
 const versionCheck = require('github-version-checker')
 const options = {
     // token: '...',
@@ -12,6 +12,7 @@ const options = {
 }
 
 try {
+    // highlight-next-line
     const update = await versionCheck(options)
     if (update) { // update is null if there is no update available, so check here
         console.log('An update is available! ' + update.name)

docs/examples/01-basic/callback.md

@@ -2,7 +2,7 @@
 
 Using a plain old callback.
 
-````js
+````js showLineNumbers title="src/util/version-check.js"
 const versionCheck = require('github-version-checker')
 const options = {
     // token: '...',

docs/examples/01-basic/promise.md

@@ -2,7 +2,7 @@
 
 Modern version using a Promise-based approach.
 
-```js
+```js showLineNumbers title="src/util/version-check.js"
 const versionCheck = require('github-version-checker')
 const options = {
     // token: '...',

docs/examples/02-advanced/git-tags.md

@@ -5,13 +5,14 @@ releases api won't work.
 
 Fetch the tags instead by setting `fetchTags` to `true`:
 
-```js
+```js showLineNumbers title="src/util/version-check.js"
 const versionCheck = require('github-version-checker')
 const options = {
     token: 'my-token',
     repo: 'github-version-checker',
     owner: 'axelrindle',
     currentVersion: require('../package.json').version,
+    // highlight-next-line
     fetchTags: true
 }
 

docs/examples/02-advanced/rest.md

@@ -4,9 +4,10 @@ There may be scenarios where you explicitly want to call the REST API.
 
 Set the `token` to `false` to accomplish this:
 
-```js
+```js showLineNumbers title="src/util/version-check.js"
 const versionCheck = require('github-version-checker')
 const options = {
+    // highlight-next-line
     token: false,
     repo: 'github-version-checker',
     owner: 'axelrindle',