doc: fix typos and grammar in BUILDING.md & onboarding.md #54812

Re-run triggered January 3, 2026 23:34

#61267

Status Success

Total duration 1m 35s

Artifacts 1

doc.yml

on: pull_request

Produced during runtime

Name	Size	Digest
docs	5.58 MB	`sha256:c1997cdbcb65f0dd71a3fc2641ac0baaadee5afa826e333bcd54ee376ff79dd9`