Fix spelling typos in authored docs (documentatoin, preceeded, preferrable)

[miharp]

Summary

A spell-check pass over the tracked Markdown surfaced recurring misspellings. This issue covers only the ones in docs authored/maintained in this repo. Vendored and build-generated pages are excluded (see below) because fixing them here would either regress on the next sync or isn't possible (they aren't tracked here).

Typos to fix (authored docs)

Typo	Correction	Locations
documentatoin	documentation	WORKFLOW.md:11,12
preceeded	preceded	docs/_openvox_8x/lang_classes.markdown:114; docs/_openvox_8x/lang_defined_types.markdown:113
preferrable	preferable	docs/_openvox_8x/lang_template_epp.md:285; docs/_openvox_8x/lang_template_erb.md:293

Excluded (not authored here)

• Vendored from upstream OpenVoxDB. heirarchy, expresions, reccomend, and represntation under docs/_openvoxdb_8x/ (api/query/v4/reports.markdown, api/wire_format/report_format_v5–v8.markdown, configure.markdown, api/query/v4/facts.markdown, api/query/v4/factsets.markdown) are carried in from the upstream OpenVoxDB documentation/ tree (verified: same files, same typos upstream, only a PuppetDB→OpenVoxDB rebrand applied). These should be fixed in the upstream OpenVoxDB documentation source so they don't drift back in on the next vendor sync.
• Build-generated reference pages (man pages, configuration.md, function.md, etc.) are produced by rake references:* at build time and are not committed to this repo, so none were in scope.

Notes

Found via cspell over git ls-files '*.md' '*.markdown'. There is no spell-check in CI; this was a one-off local pass.