chore: fix docs + turn tests back on + fix naming

[ra0x3]

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Checklist

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Description

• Tiny bikeshedding naming updates for clarity
• Fixes bug in default indexer (will require 0.20.1. release)

Testing steps

• Build plugin locally cargo build -p forc-index
• Create project forc-index new indexer-test --namespace fuellabs
• Build project forc-index build

Changelog

• chore: fix docs + turn tests back on + fix naming