Missing hyperlink for JSON.GET and broken links for rest of commands

[ccrenfroe]

Description

In the README for the JSON module, the hyperlink is missing for JSON.Get, and the other hyperlinks do not lead to the documentation for their respective commands, but rather a commands overview page

The current links in the redis documentation are as follows

https://redis.io/commands/json.[COMMAND]/

so

• https://redis.io/commands/json.get/
• https://redis.io/commands/json.set/
• https://redis.io/commands/json.arrappend/
• https://redis.io/commands/json.numincrby/