[PATCH v3 00/11][Outreachy] Improve the 'fixup [-C | -c]' in interactive rebase

This patch series is build on the top of "cm/rebase-i" in the 'next' branch and
improves it. It fixup the source code of 'fixup [-C | -c]' command in the
sequencer, do some fixes in rebase -i, improves the 'fixup_-C' like commands
in lib-rebase.sh, update the test-script 't3437' and fixes a typo in the
documentation.

Changes from v2 :
* Update the rebase-todo help
* Remove the changes and resets to fixup_-* command
* Update the documentation of FAKE_LINES
* Move the changes of "unnecessary curly braces in test" to the other patch
  (from v2-9/11 to v2-5/11)

Thanks all for the suggestions.

Charvi Mendiratta (11):
  sequencer: fixup the datatype of the 'flag' argument
  sequencer: rename a few functions
  rebase -i: clarify and fix 'fixup -c' rebase-todo help
  t/lib-rebase: update the documentation of FAKE_LINES
  t/t3437: fixup here-docs in the 'setup' test
  t/t3437: remove the dependency of 'expected-message' file from tests
  t/t3437: check the author date of fixed up commit
  t/t3437: simplify and document the test helpers
  t/t3437: use named commits in the tests
  t/t3437: fixup the test 'multiple fixup -c opens editor once'
  doc/rebase -i: fix typo in the documentation of 'fixup' command

 Documentation/git-rebase.txt    |   2 +-
 rebase-interactive.c            |   9 +--
 sequencer.c                     |  23 +++---
 t/lib-rebase.sh                 |   7 +-
 t/t3437-rebase-fixup-options.sh | 122 +++++++++++++++++---------------
 5 files changed, 87 insertions(+), 76 deletions(-)

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2.29.0.rc1