insert_image: document that rotations are counterclockwise

[cbm755]

Docs for insert_image:

rotate (int) – (new in version v1.14.11) rotate the image. Must be an integer multiple of 90 degrees. If you need a rotation by an arbitrary angle, consider converting the image to a PDF (Document.convert_to_pdf()) first and then use Page.show_pdf_page() instead.

It would be helpful if this said "rotate the image counter-clockwise."

(I've just spent some time debugging something that mixes mogrify (cw), PIL (ccw) and fitz (ccw); it would be helpful to have these things written down in the docs).

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Sorry for not sending a PR; but it would be good for someone to double-check that I'm right ;-)

[JorjMcKie]

Accepted. As is customary, throughout PDF at least, positive angles rotate counter-clockwise, negative angles are clockwise.

[julian-smith-artifex-com]

I have updated the docs in my tree to mention this.