Support for automatic spell-checking

[vszabo2]

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Description

Currently, the project uses github.com/client9/misspell/cmd/misspell to spell-check the documentation. This only flags "commonly misspelled English words." Many not-so-common misspellings have slipped through the cracks (https://github.com/kreuzwerker/terraform-provider-docker/pulls?q=spelling). I propose changing the Makefile to use a more robust spell-checker.