Improve documentation around sum function

Description

When using the sum function, a single value is automatically returned unless `return_frame=True`. Update the Python/R documentation to make this more clear.

Assignee

Megan Kurka

Fix versions

Reporter

Megan Kurka

Support ticket URL

None

Labels

None

Affected Spark version

None

Customer Request Type

None

Task progress

None

ReleaseNotesHidden

None

CustomerVisible

No

Priority

Major
Configure