[DOC] Copy text button not copying entire content

Report incorrect documentation

Location of incorrect documentation
The first code box under the Examples section in:
https://docs.rapids.ai/api/cudf/stable/user_guide/api_docs/api/cudf.core.column.string.stringmethods.split/#cudf.core.column.string.StringMethods.split

Describe the problems or issues found in the documentation
The box contains this code:

import cudf
data = ["this is a regular sentence",
    "https://docs.python.org/index.html", None]
s = cudf.Series(data)
s
0            this is a regular sentence
1    https://docs.python.org/index.html
2                                  <NA>
dtype: object

clicking the copy button results in the following:

import cudf
data = ["this is a regular sentence",
s = cudf.Series(data)
s

Open the linked cudf StringMethods.split documentation page and reproduce the problem with the first code box under Examples. Trace the documentation site's copy-button behavior and compare copied text with the full displayed block. Done means the button copies all of the code and output shown in that box.