Globally replace "stanza" with "block" when referring to HCL

[schmichael]

Nomad is lagging behind Terraform and other HCL-enabled projects by calling foo { ... } a "stanza" instead of a "block" in docs.

We should fix that and do a big global search and replace on stanza -> block. I can't think of anywhere this would cause backward compatibility issues, but if any are encountered we will have to stop and consider each one.

[schmichael]

We should backport this change to ease future backports (thanks to @tgross for pointing this out).

Don't forget tutorials! They live in another repo (thanks to @angrycub for pointing this out).

[lhaig]

Tutorial Branch
https://github.com/hashicorp/tutorials/compare/nomad-update-stanza-to-block-in-docs
I can't create a branch for the nomad repository.

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