[PATCH v3] MyFirstContribution: Document --range-diff option when writing v2

In the "Sending v2" section, readers are directed to create v2 patches without using --range-diff. However, it is customary to include a range-diff against the v1 patches as a reviewer aid.

Update the "Sending v2" section to suggest a simple workflow that uses the --range-diff option. Also include some explanation for -v2 and --range-diff to help the reader understand the importance.

Signed-off-by: Glen Choo <chooglen@google.com>
---
This tightens up some of the language from v2, but is otherwise largely
similar. As always, thanks for the input!

Changes since v2:
* clarify that the range-diff is inserted into the cover letter
* describe -v2 as creating version "2" instead of "v2"
* fix typo in email prefix (s/V2/v2)
* explicitly compare the v2 glob pattern with the v1 glob pattern

Interdiff against v2:
  diff --git a/Documentation/MyFirstContribution.txt b/Documentation/MyFirstContribution.txt
  index 790bf1e8b5..b20bc8e914 100644
  --- a/Documentation/MyFirstContribution.txt
  +++ b/Documentation/MyFirstContribution.txt
  @@ -1041,8 +1041,8 @@ $ git checkout psuh
   $ git branch psuh-v1
   ----
   
  -Make your changes with `git rebase -i`. Once you're ready with the next
  -iteration of your patch, the process is fairly similar to before. Generate your
  +Refine your patch series by using `git rebase -i` to adjust commits based upon
  +reviewer comments. Once the patch series is ready for submission, generate your
   patches again, but with some new flags:
   
   ----
  @@ -1050,20 +1050,21 @@ $ git format-patch -v2 --cover-letter -o psuh/ --range-diff master..psuh-v1 mast
   ----
   
   The `--range-diff master..psuh-v1` parameter tells `format-patch` to include a
  -range-diff between `psuh-v1` and `psuh` (see linkgit:git-range-diff[1]). This
  -helps tell reviewers about the differences between your v1 and v2 patches.
  +range-diff between `psuh-v1` and `psuh` in the cover letter (see
  +linkgit:git-range-diff[1]). This helps tell reviewers about the differences
  +between your v1 and v2 patches.
   
  -The `-v2` parameter tells `format-patch` to output "v2" patches. For instance,
  -you may notice that your v2 patches, are all named like
  -`v2-000n-my-commit-subject.patch`. `-v2` will also format your patches by
  -prefixing them with "[PATCH V2]" instead of "[PATCH]", and your range-diff will
  -be prefaced with "Range-diff against v1".
  +The `-v2` parameter tells `format-patch` to output your patches
  +as version "2". For instance, you may notice that your v2 patches are
  +all named like `v2-000n-my-commit-subject.patch`. `-v2` will also format
  +your patches by prefixing them with "[PATCH v2]" instead of "[PATCH]",
  +and your range-diff will be prefaced with "Range-diff against v1".
   
   Afer you run this command, `format-patch` will output the patches to the `psuh/`
   directory, alongside the v1 patches. Using a single directory makes it easy to
   refer to the old v1 patches while proofreading the v2 patches, but you will need
   to be careful to send out only the v2 patches. We will use a pattern like
  -"psuh/v2-*.patch" ("psuh/*.patch" would match v1 and v2 patches).
  +"psuh/v2-*.patch" (not "psuh/*.patch", which would match v1 and v2 patches).
   
   Edit your cover letter again. Now is a good time to mention what's different
   between your last version and now, if it's something significant. You do not

 Documentation/MyFirstContribution.txt | 42 ++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 11 deletions(-)