docs: fix typos and grammar across the v2 documentation

[Avicennasis]

Summary

Fixes typos and grammar errors across the v2 documentation. Content only — no page front-matter was touched.

From the reported list (15 of 17 rows confirmed against live master)

• install/awsecs.md: bundle run it all -> bundle and run it all; horiztonal -> horizontal; It will also distributes -> It will also distribute
• install/ubuntu.md: udpates -> updates; optionaly -> optionally; certifiate -> certificate; will not be redirect to HTTPS -> redirected
• groups.md: explicitely -> explicitly; preferrable -> preferable; great a limiting -> great at limiting
• rendering.md: supercript -> superscript; Allow HTML: Enable HTML tabs in content -> tags
• troubleshooting.md: Administrator Area -> Administration Area; functionnality -> functionality
• install/docker.md: file containing to the database password -> file containing the database password

Two notes on that list:

• certifiate is inside a quoted log line. I checked server/core/letsencrypt.js in requarks/wiki, which logs (LETSENCRYPT) New certificate received successfully: [ COMPLETED ] — so the fix makes the doc match the real output rather than diverging from it.
• Administrator Area appears exactly once in the whole repo; Administration Area appears 17 times, including two lines above it in the same file.

Additionally noticed while reviewing (not in the original report)

• dev/comments.md: An comments module adds discussion capabitilies -> A comments module adds discussion capabilities
• install/kubernetes.md: persistance -> persistence; Persistant Volume Claims -> Persistent; Postgers PVC Storage Request -> Postgres (matching the row above it); ## PostgresSQL -> ## PostgreSQL
• install/transfer.md: mentionned -> mentioned
• auth/slack.md: Nagivate -> Navigate
• auth/keycloak.md: You wil need -> You will need
• install/aws.md: preferrably -> preferably
• install/sideload.md: the files localed in -> the files located in
• install/config.md: Refer to to the -> Refer to the
• guide/assets.md: specic alignment -> specific alignment
• dev.md: A reproducable build workflow -> A reproducible build workflow

Deliberately left alone

• There're (9 occurrences repo-wide, including groups.md) — that is a consistent authorial voice, not a one-off slip.
• javascript -> JavaScript in troubleshooting.md — casing preference, and line 68 is a heading whose anchor would change.
• The releases/*.md archive (historical release notes) even though it contains several misspellings — rewriting published changelogs seemed out of scope. Happy to send that separately if you want it.
• YAML front-matter on every page (date, description, …), since that is synced page metadata.
• favourite in install/awsecs.md (dialect) and ressources in dev/api.md's description.