Update cookbook: Replace --tesseract-timeout 0 with --ocr-engine none

Update documentation examples to use the new --ocr-engine none option
instead of the deprecated --tesseract-timeout 0 idiom for disabling OCR.

docs/cookbook.md

@@ -215,15 +215,22 @@ ocrmypdf --deskew --clean --rotate-pages input.pdf output.pdf
 Don\'t actually OCR my PDF
 --------------------------
 
-If you set `--tesseract-timeout 0` OCRmyPDF will apply its image
-processing without performing OCR (by causing OCR to time out). This
-works if all you want to is to apply image processing or PDF/A
+If you set `--ocr-engine none` OCRmyPDF will apply its image processing without
+performing OCR. This works if all you want to is to apply image processing or PDF/A
 conversion.
 
 ```bash
-ocrmypdf --tesseract-timeout 0 --remove-background input.pdf output.pdf
+ocrmypdf --ocr-engine none --deskew --output-type pdfa input.pdf output.pdf
 ```
 
+:::{versionchanged} v17.0.0
+
+Prior to this version, `--tesseract-timeout 0` was recommended as an idiom
+to turn off OCR. This is not longer recommended, as we move away from
+Tesseract OCR as the primary OCR engine.
+
+:::
+
 :::{versionchanged} v14.1.0
 
 Prior to this version, `--tesseract-timeout 0` would prevent other uses
@@ -238,7 +245,7 @@ This is getting ridiculous, but OCRmyPDF can complete strip all textual
 information from a PDF and reconstruct it as a \"bag of images\" PDF.
 
 ```bash
-ocrmypdf --tesseract-timeout 0 --force-ocr input.pdf output.pdf
+ocrmypdf --ocr-engine none --force-ocr input.pdf output.pdf
 ```
 
 Why would you want to do this? Perhaps you have a PDF where OCR fails to
@@ -250,7 +257,7 @@ This command also removes OCR generated by third party tools.
 You can also optimize all images without performing any OCR:
 
 ```bash
-ocrmypdf --tesseract-timeout 0 --optimize 3 --skip-text input.pdf output.pdf
+ocrmypdf --ocr-engine none --optimize 3 --skip-text input.pdf output.pdf
 ```
 
 ### Process only certain pages