Update Go driver links in FLE documentation

Description

The FLE docs here provide a not great user experience for Go developers:

https://docs.mongodb.com/drivers/security/client-side-field-level-encryption-guide/

The Go tab under additional dependencies sends you to the README for libmongocrypt. None of our users are going to be able to figure out what to do after following that link. A better user experience might be to point Go users to the Go driver docs for FLE here:

https://pkg.go.dev/go.mongodb.org/mongo-driver/mongo#hdr-Client_Side_Encryption

CC kenneth.white rachelle.palmer

A/C

 As a user, I can understand what libmongocrypt is and how to install it as a dependency for the driver I am using.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)