Add to docs that can now control number of columns to display in dataframe in R client in Jupyter notebook

[exalate-issue-sync]

New feature was added to control number of columns when displaying a dataframe in R: https://0xdata.atlassian.net/browse/PUBDEV-7136

Add info in Docs:
All rows of a data frame in a Jupyter notebook with an R kernel can be seen by setting up options repr.matrix.max.rows and repr.matrix.max.cols

i.e. like this:

options(repr.matrix.max.rows=600, repr.matrix.max.cols=200)

The defaults are 60 and 20.

[exalate-issue-sync]

Angela Bartz commented: [~accountid:5d1185d4f46aa30c271c7cc6], can you update the http://docs.h2o.ai/h2o/latest-stable/h2o-r/docs/reference/h2o.head.html topic to include comments describing what each example does? And please branch off of rel-yu.

For example:
{code}

Return the first 6 rows and 200 columns

h2o.head(x, n = 6L, m = 200L, ...)
{code}
etc.

Then add another example:
{code}

For Jupyter notebook with an R kernel,

view all rows of a data frame

options(repr.matrix.max.rows=600, repr.matrix.max.cols=200)
{code}

[h2o-ops]

JIRA Issue Migration Info

Jira Issue: PUBDEV-7328
Assignee: hannah.tillman
Reporter: Neema Mashayekhi
State: Resolved
Fix Version: 3.28.1.1
Attachments: N/A
Development PRs: Available

Linked PRs from JIRA

#4378