Add 'data source' and 'resource' to Terraform entries

# Feature request

## Problem Summary

when searching for Terraform resources, e.g. `aws_ecs_task_definition`, it's difficult to tell which is the 'data source' entry and which is the 'resource' entry:

this can make it significantly harder to use DevDocs for finding Terraform docs, as opposed to the official Terraform docs which denote the different resource based on a kind of 'directory' structure:

## Proposed Solution

add `(resource)` and `(data source)` suffixes to the respective listings for Terraform entries:

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happy to create a PR to implement this! would appreciate any pointers for starting files as I haven't contributed to the repo before :)