Change all docs filenames to .adoc
This commit renames all AsciiDoc files to have the ".adoc" extension.
Also, this commit updates all "include::" references in the root.adoc
file.
RATIONALE: Some editing tools, including GitHub, will auto-generate an
HTML preview for AsciiDoc files if they have the filename extension
".adoc" or ".asciidoc". The community agreed to this change in 2015 (see
http://markmail.org/thread/z2s7xnxavpjzirwx).
NOTE: The docs build script will need to change the reference from
"root.txt" to "root.adoc".
Signed-off-by: Remington Steed <rjs7@calvin.edu>
- [D] docs/serials/Group_Serials_Issues_in_the_OPAC_2.2.adoc