add get_all_videos_and_images.py code example (#252)
add get_all_videos_and_images.py code example (#252)

* code example for update expanded text ads

* fixed argument wording

* wording tweaks, use f-string

* add punctuation

* quote around resource name, and end sentence with a period

* filename change

* add description field

* removing empty line

* add get_all_videos_and_images.py code example

* address comments for get_all_videos_and_images.py

Co-authored-by: Fei Xiang <34d2426fe1bd482c9bd2379e7c96fa84ac658ce9@users.noreply.github.com>
googleads/google-ads-python