doc: add some missing technical documents

Commit bcf7edee09 ("meson: generate articles", 2024-12-27) added the generation of the 'howto' and 'technical' documents to the meson build. At this time those documents had a '*.txt' file extension, but they were renamed with an '*.adoc' extension by commit 1f010d6bdf ("doc: use .adoc extension for AsciiDoc files", 2025-01-20), for the most part. For the meson build, commit 87eccc3a81 ("meson: fix building technical and howto docs", 2025-03-02) fixed the meson.build files, which had not been updated when the files were renamed. However, the 'Documentation/Makefile' has not been updated to include all of the recently added technical documents. In particular, the following are built by meson, but not by the Makefile: commit-graph.adoc directory-rename-detection.adoc packfile-uri.adoc remembering-renames.adoc repository-version.adoc rerere.adoc sparse-checkout.adoc sparse-index.adoc In order to ensure that both build systems format the same technical documents, add the above documents to the TECH_DOCS variable in the Documentation/Makefile. Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>