Is your proposal related to a problem?

For JPEG files, both the .jpg and .jpeg file extensions are in use in the wild. Our WAGTAILIMAGES_EXTENSIONS setting treats them as separate extensions (as they are), which can create friction / confusion when the setting is used incorrectly: if it only contains jpg, all .jpeg files will fail to upload. This doesn’t seem like a particularly useful behavior as the files are identical anyway.

Describe the solution you'd like

We could make our file extension checker cleverer, so even if only jpg or jpeg are included, images can be uploaded with either extensions?

Describe alternatives you've considered

Or we could update our documentation so the canonical example reflects the need to use both jpg and jpeg.

Additional context

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