doc: fix typos and grammar in `BUILDING.md` & `onboarding.md` #9

Triggered via push January 6, 2026 14:28

sxa

main

Status Success

Total duration 1m 32s

Artifacts 1

doc.yml

on: push

Produced during runtime

Name	Size	Digest
docs	5.58 MB	`sha256:10ca1aad9bf957644ccbbbc7c7b7e395b02e440c0c48ae0011636c2d73fb5387`