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: <redacted>

* 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

diff --cc Documentation/Makefile
index f2e7fc1daa5f95696510cd38d689a119fd5f2a72,8d405a14330ea9f37f033362519e4b8425290934..4f801f4e4c9470c42ae7933a68970a4984bc54b5
--- 1/Documentation/Makefile
--- 2/Documentation/Makefile
+++ b/Documentation/Makefile
@@@ -94,8 -94,8 +94,9 @@@ TECH_DOCS += MyFirstContributio
  TECH_DOCS += MyFirstObjectWalk
  TECH_DOCS += SubmittingPatches
  TECH_DOCS += ToolsForGit
+ TECH_DOCS += technical/bitmap-format
  TECH_DOCS += technical/bundle-format
 +TECH_DOCS += technical/cruft-packs
  TECH_DOCS += technical/hash-function-transition
  TECH_DOCS += technical/http-protocol
  TECH_DOCS += technical/index-format