Improve subtree merge command line.

Subtree merge doesn't always work as intended here.

For example, I tried these instructions with two repositories,
repository A, which contained a README file, and repository B, which
contained README and AUTHORS files. I used read-tree to put repository
B into a subdirectory of repository A, then ran the git merge
incantation affected by this patch.

With Git 1.9.1 from the Ubuntu 14.04 repositories, git-merge decided
that the correct subtree of A to merge B into was the root directory
of A, perhaps because the directory structure was similar enough to
satisfy some heuristic.

Replace the subtree strategy with recursive and explicit hint about
where the subtree is, which worked as intended. The output ("Squash
commit [...] as requested") was unchanged.

Signed-off-by: Marti Bolivar <mbolivarmullen@gmail.com>
Translate "1-distributed-git.asc"
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Adjusted filename in git merge output

The previous operations on iss53 were clearly on index.html, so the
merge output should reflect that too for consistency. :)
Merge pull request #190 from justinclift/iss53_filename_fix

Adjusted filename in git merge output
Change merge commit to C6
Merge pull request #192 from progit/fix-figure

Change merge commit to C6
Fix commentout markup

I used asciidoc markup for commenting out the source text, but this is a markdown file.
Fix typo in URL of the smart git-receive-pack

Reference: https://git.kernel.org/cgit/git/git.git/tree/Documentation/technical/http-protocol.txt#n292
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Fix markup
Merge pull request #193 from damz/patch-1

Fix typo in URL of the smart git-receive-pack
Merge remote-tracking branch 'upstream/master'
Fix #25
Update rebasing.asc

Tiny typo

Git calculate a checksum -> Git calculates a checksum
Merge pull request #23 from harupong/translate-ch05

Translate Chapter5 "Distributed Git"
Merge pull request #195 from rahrah/patch-1

Update rebasing.asc
Merge pull request #153 from mbolivar/fix-subtree-merge

Improve subtree merge command line.