Merge branch 'ac/bitmap-format-doc' into maint

Adjust technical/bitmap-format to be formatted by AsciiDoc, and add some missing information to the documentation. source: <pull.1246.v4.git.1655355834.gitgitgadget@gmail.com> * ac/bitmap-format-doc: bitmap-format.txt: add information for trailing checksum bitmap-format.txt: fix some formatting issues bitmap-format.txt: feed the file to asciidoc to generate html