Fix Broken Documentation Links (#1275)

* Update URL for PDFMARK documentation

For reference, here is a link to the old PDF:
https://web.archive.org/web/20190806035303/https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdfmark_reference.pdf

It appears Adobe converted the PDF into a webpage-based document, the
wording seems to almost identical b/w the PDF and the website.

* Fix cross-references to JBIG2 page

* Fix links for Fedora + Arch + HEAD revision install

Fedora 39 has been released, and the package tracker no longer includes
a release overview for Fedora 37 hence why it was removed here.

src/ocrmypdf/pdfa.py

@@ -90,7 +90,7 @@ def generate_pdfa_ps(target_filename: Path, icc: str = 'sRGB'):
         icc: ICC identifier such as 'sRGB'
     References:
         Adobe PDFMARK Reference:
-        https://www.adobe.com/content/dam/acom/en/devnet/acrobat/pdfs/pdfmark_reference.pdf
+        https://opensource.adobe.com/dc-acrobat-sdk-docs/library/pdfmark/
     """
     if icc != 'sRGB':
         raise NotImplementedError("Only supporting sRGB")