doc: SHASUMS256, not SHASUM256
As an example, curl https://nodejs.org/dist/v8.4.0/SHASUM256.txt will
return a 404 right now.
Checklist
-
documentation is changed or added -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
As an example, curl https://nodejs.org/dist/v8.4.0/SHASUM256.txt will
return a 404 right now.
doc