Include example of variable resolution in terminal profiles

[Tyriar]

https://code.visualstudio.com/docs/editor/integrated-terminal#_terminal-profiles

Was asked for in microsoft/vscode#120667 but already exists

[gregvanl]

From Daniel:
Here's a more generic example you could put there:
"My PowerShell": {
"path": "pwsh.exe"
"args": [
"-noexit",
"-file",
"${env:APPDATA}\PowerShell\my-init-script.ps1"
]
}
And then link to https://code.visualstudio.com/docs/editor/variables-reference for the variables reference page

[gregvanl]

Thanks @meganrogge!