Document workaround for ENOSPC error #12849

Prerequisites

• Can you reproduce the problem with Debug \ Reload Without Extensions?
• Did you perform a cursory search to see if your bug or enhancement is already reported?
• Did you read the Troubleshooting guide?

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Description

While using my VM of Ubuntu I hit the ENOSPC error.
I don't know if it was related with me messing with brackets-shell code, however I found this guide on VSCode https://code.visualstudio.com/docs/setup/linux#_error-enospc and this stackoverflow answer
It is possible we will need to document this error too.

Versions

Linux
master