docs: cacheHandlers use object instead of class

[H01001000]

This PR fixes the docs' example where it used class (like cacheHandler (no s)), but cacheHandlers expect an object.

[ijjk]

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[graphite-app]

The object literal syntax doesn't support constructor methods like classes do. When converting from a class to an object, the Redis client initialization needs to be moved outside the exported object. Consider restructuring like this:

const { createClient } = require('redis')
const client = createClient({ url: process.env.REDIS_URL })
client.connect()

module.exports = {
  // Methods that use client
  async get(cacheKey, softTags) {
    // Implementation using client
  },
  // Other methods...
}

This ensures the Redis client is properly initialized before the module is exported and can be used by the handler methods.

Suggested change

	module.exports = {
	constructor() {
	this.client = createClient({ url: process.env.REDIS_URL })
	this.client.connect()
	const { createClient } = require('redis')
	const client = createClient({ url: process.env.REDIS_URL })
	client.connect()
	module.exports = {

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[icyJoseph]

Great catch, and come to think I actually answered an issue about this with the right info... 🤦 it happens