(doc) Add link to side-by-side package naming docs

[pauby]

Description Of Changes

Added link to side-by-side package naming documentation as an option for people upgrading to 2.x

Motivation and Context

Was responding to a support issue this morning and realised we say that side-by-side installs have been removed, but don't link to the docs that talk about naming packages differently to get, potentially, the same issue.

Testing

• [x] I have previewed these changes using the Docker Container or another method before submitting this pull request.

Change Types Made

• [x] Minor documentation fix (typos etc.).
• [ ] Major documentation change (refactoring, reformatting or adding documentation to existing page).
• [ ] New documentation page added.
• [ ] The change I have made should have a video added, and I have raised an issue for this.
  • Issue #

Change Checklist

• [ ] Requires a change to menu structure (top or left-hand side)/
• [ ] Menu structure has been updated

Related Issue

N/A

[pauby]

I've updated the text @mkevenaar. Thanks for your time reviewing it.

[gep13]

@pauby thanks for getting this updated!