[AMQ-9303] Fix the link to the configuration FAQ

[essobedo]

Fix for https://issues.apache.org/jira/browse/AMQ-9303

Motivation

The link to the configuration FAQ is broken in the Getting Started guide

Modifications

• Fix the link to refer to the configuration FAQ like it was in the past
• Fix a small typo in the same sentence

[jbonofre]

I will merge manually to fix the conflicts.