docs: Correct typos on docs/en/guides/index.md

[alexnelsone-aws]

There are a few typos on docs/en/guides/index.md that need to be corrected:

• workload has add benefits to workload has added benefits
• it would impossible to it would be impossible to
• alerting of applications health on to alerting of application health on
• in your workload later one, use it to in your workload later on, use it
• as a way to obsession over our customers to as a way to obsess over our customers