Reduce draft release notes to 1.7.12

Many "fixes since 1.7.11" items are now in the maintenance track

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.7.12.txt

@@ -103,64 +103,3 @@ details).
    use "$PERL_PATH", the version of Perl the user told Git to use, in
    our tests to avoid unnecessary breakages in tests.
    (merge ad78585 vr/use-our-perl-in-tests later to maint).
-
- * "git blame" did not try to make sure that the abbreviated commit
-   object names in its output are unique.
-   (merge b31272f jc/maint-blame-unique-abbrev later to maint).
-
- * On Cygwin, the platform pread(2) is not thread safe, just like our
-   own compat/ emulation, and cannot be used in the index-pack
-   program.  Makefile variable NO_THREAD_SAFE_PREAD can be defined to
-   avoid use of this function in a threaded program.
-   (merge c0f8654 rj/platform-pread-may-be-thread-unsafe later to maint).
-
- * "git clone --single-branch" to clone a single branch did not limit
-   the cloning to the specified branch.
-   (merge 0ec4b16 nd/clone-single-fix later to maint).
-
- * "git diff --no-index" did not correctly handle relative paths and
-   did not correctly give exit codes when run under "--quiet" option.
-   (merge 304970d th/diff-no-index-fixes later to maint).
-
- * When "git log" gets "--simplify-merges/by-decoration" together with
-   "--first-parent", the combination of these options makes the
-   simplification logic to use in-core commit objects that haven't
-   been examined for relevance, either producing incorrect result or
-   taking too long to produce any output.  Teach the simplification
-   logic to ignore commits that the first-parent traversal logic
-   ignored when both are in effect to work around the issue.
-   (merge 6e513ba jc/rev-list-simplify-merges-first-parent later to maint).
-
- * "git add" allows adding a regular file to the path where a
-   submodule used to exist, but "git update-index" does not allow an
-   equivalent operation to Porcelain writers.
-   (merge 242f55f hv/submodule-update-nuke-submodules later to maint).
-
- * "git diff --no-index" did not work with pagers correctly.
-   (merge af63b54 jk/diff-no-index-pager later to maint).
-
- * "git diff COPYING HEAD:COPYING" gave a nonsense error message that
-   claimed that the treeish HEAD did not have COPYING in it.
-   (merge 023e37c mm/verify-filename-fix later to maint).
-
- * The documentation for "git cherry-pick A B..C" was misleading.
-   (merge b98878e cn/cherry-pick-range-docs later to maint).
-
- * "git archive" incorrectly computed the header checksum; the symptom
-   was observed only when using pathnames with hi-bit set.
-   (merge a5a46eb jc/ustar-checksum-is-unsigned later to maint).
-
- * Running "git bundle verify" on a bundle that records a complete
-   history said "it requires these 0 commits".
-   (merge 8c3710f jc/bundle-complete-notice later to maint).
-
- * "git ls-files --exclude=t -i" did not consider anything under t/ as
-   excluded, as it did not pay attention to exclusion of leading paths
-   while walking the index.  Other two users of excluded() are also
-   updated.
-   (merge 0d316f0 jc/ls-files-i-dir later to maint).
-
- * "git request-pull $url dev" when the tip of "dev" branch was tagged
-   with "ext4-for-linus" used the contents from the tag in the output
-   but still asked the "dev" branch to be pulled, not the tag.
-   (merge 682853e jc/request-pull-match-tagname later to maint).