Would like some extra clarity around using pbiFormat as the formatType

[MikeCarlo]

Issue:

I was building a heatmap where I had a date column coming in from Power BI. I needed to format the text inside the column and was struggling to change the formatting based on the Vega-lite documentation: https://vega.github.io/vega-lite/docs/format.html

Resolution:
Solving this problem was using the axis formatting like so:

  "axis": {
    "formatType": "pbiFormat",
    "format": "MMM dd"
  }

I needed to add the formatType of pbiFormat into the Axis definition.

When I read the docs, I somehow missed this.
it would be nice to highlight this a bit more, and possibly add an example or two about this.