[Doc] Add integers to four digit year format example

[ChiaLingWeng]

This will close #3162 .
Add an example as below comparing using quantitative, ordinal and temporal data type.

With explanation:
To plot the year data as four digit format; i.e. without thousand separator, we recommend converting integer to string data type first, then storing the data as temporal, since directly convert integer to temporal data type would result in an error.

And also close #1365

[joelostblom]

Thanks for this @ChiaLingWeng ! I made some modifications directly to the PR and will go ahead and merge.