doc: fixed typos in doc/api/deprecations.md and doc/api/diagnostics_channel.md
in doc/api/deprecations.md -> 'ambiguity' was spelled 'ambigiuty' in doc/api/diagnostics_channel.md -> 'sensitive' was spelled 'senstive' (twice)
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
in doc/api/deprecations.md -> 'ambiguity' was spelled 'ambigiuty' in doc/api/diagnostics_channel.md -> 'sensitive' was spelled 'senstive' (twice)