Documentation for creating `import.tf` is outdated, missing `--generate-import-block`

[hterik]

https://learn.microsoft.com/en-us/azure/developer/terraform/azure-export-for-terraform/select-custom-resources#using-terraform-import-blocks contains faulty instructions for generating import.tf
The page instructs to use the --generate-mapping-file but it is not working.

A new --generate-import-block was added in #516 and it appears to work better instead.

[stemaMSFT]

@magodo to confirm we no longer generate import blocks through -g or --generate-mapping-file?

[magodo]

@stemaMSFT Two options exist:

• --generate-mapping-file / -g: This indicates to only generate the mapping file (aztfexportResourceMapping.json), but not do the following import/export tasks.
• --generate-import-block: This will generate the import.tf along with the aztfexportResourceMapping.json.

So the document here needs to update.

[stemaMSFT]

Got it. Can we also add a short form, i.e. --i for --generate-import-block?

[magodo]

I'd suggest not to do it as -i as it is typically used for "input" in short. Also, it is not so necessary as this option is enabled by default, people will only use it if they want to disable that.