[PATCH v2 0/2] [doc] Remove gittutorial-2

This patch series removes gittutorial-2 and all references to it, leaving a stub behind to help out any users who might be looking for this documentation.

The goal is to remove obsolete documentation and make it easier to improve our tutorial material in the future.

I tested that the docs are staying internally consistent by running git grep tutorial-2 and making sure that the only remaining references are in the Makefiles, the document itself, and some example output in user-manual.adoc which isn't relevant to the actual manual.

Changes in v2:

 * Remove changes to .po files (thanks to Junio)
 * Reword commit messages to doc: ... (thanks to Tuomas)

To deal with the conflict with 4ce144a1 (which requires that all guides be listed in command-list.txt) I think we need to add another exception to lint-manpages.sh (like Tuomas said).

Julia Evans (2):
  doc: remove gittutorial-2
  doc: remove references to gittutorial-2

 Documentation/MyFirstObjectWalk.adoc |   2 +-
 Documentation/git.adoc               |   2 +-
 Documentation/gitcore-tutorial.adoc  |   1 -
 Documentation/gitcvs-migration.adoc  |   2 +-
 Documentation/gitglossary.adoc       |   1 -
 Documentation/gittutorial-2.adoc     | 422 +--------------------------
 Documentation/gittutorial.adoc       |  23 +-
 7 files changed, 14 insertions(+), 439 deletions(-)

base-commit: 0f8e75abebff0877cae681a3d5ff31ac47f54220
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-2241%2Fjvns%2Fdelete-tutorial2-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-2241/jvns/delete-tutorial2-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/2241

Range-diff vs v1:

 1:  54404cd8df ! 1:  5fd36f91f0 [doc] Remove gittutorial-2
     @@ Metadata
      Author: Julia Evans <julia@jvns.ca>
      
       ## Commit message ##
     -    [doc] Remove gittutorial-2
     +    doc: remove gittutorial-2
      
          It hasn't been substantially updated for 20 years
          (see `git diff e31952da5c52a4c1:Documentation/tutorial-2.txt
 2:  a76819e3af ! 2:  68867aa3fc [doc] Remove references to gittutorial-2
     @@ Metadata
      Author: Julia Evans <julia@jvns.ca>
      
       ## Commit message ##
     -    [doc] Remove references to gittutorial-2
     +    doc: remove references to gittutorial-2
      
          Redirect folks to `gitdatamodel` instead, since every time it's
          referenced the intent is to explain objects, references, blobs, etc.
 3:  017ca1346d < -:  ---------- [doc] Delete translations of gittutorial-2 description