DOC: improve gallery test instructions #5100
Merged
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🚀 Pull Request
Description
Since #4792, it is no longer necessary to add a test file with each new gallery entry, because we generate them using
glob
:iris/docs/gallery_tests/test_gallery_examples.py
Lines 18 to 22 in dfbc5c2
I also added some links from the gallery testing instructions to the image testing instructions, as I was struggling to find my way around when recently wanting to update a gallery test image file.
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