Add reference documentation for dictionary template file

[jdbaldry]

With reference documentation in place, I think I can start to write specific task documentation for adding different kinds of new words like:

• Add a verb
• Add a product
• Add an acronym

Relates to https://github.com/grafana/writers-toolkit/issues/669

[github-actions[bot]]

Readability report

File	AutomatedReadability	ColemanLiau	FleschKincaid	FleschReadingEase	GunningFog	LIX	SMOG
docs/sources/review/lint-prose/dictionary.md	$${7.92\space\color{black}(Δ+0.00)}$$	$${10.75\space\color{black}(Δ+0.00)}$$	$${9.04\space\color{black}(Δ+0.00)}$$	$${52.19\space\color{black}(Δ+0.00)}$$	$${9.60\space\color{black}(Δ+0.00)}$$	$${41.75\space\color{black}(Δ+0.00)}$$	$${11.33\space\color{black}(Δ+0.00)}$$

View metric targets

| Metric | Range | Ideal score | | --- | --- | --- | | [AutomatedReadability](https://en.wikipedia.org/wiki/Automated_readability_index) | 6 (very easy read) to 14 (extremely difficult read) | 8 or less | | [ColemanLiau](https://en.wikipedia.org/wiki/Coleman%E2%80%93Liau_index) | 6 (very easy read) to 17 (extremely difficult read) | 9 or less | | [FleschKincaid](https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests) | 6 (very easy read) to 17 (extremely difficult read) | 8 or less | | [FleschReadingEase](https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests) | 100 (very easy read) to 0 (extremely difficult read) | 70 or more | | [GunningFog](https://en.wikipedia.org/wiki/Gunning_fog_index) | 6 (very easy read) to 17 (extremely difficult read) | 10 or less | | [LIX](https://en.wikipedia.org/wiki/Lix_(readability_test)) | 20 (very easy read) to 60+ (extremely difficult read) | 35 or less | | [SMOG](https://en.wikipedia.org/wiki/SMOG) | 6 (very easy read) to 17 (extremely difficult read) | 10 or less |