Update draft release notes to 2.2

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

Documentation/RelNotes/2.2.0.txt

@@ -23,6 +23,24 @@ UI, Workflows & Features
    the difference between the base commit version and the working tree
    version, which is in line with what "git show" gives.
 
+ * Sometimes users want to report a bug they experience on their
+   repository, but they are not at liberty to share the contents of
+   the repository.  "fast-export" was taught an "--anonymize" option
+   to replace blob contents, names of people and paths and log
+   messages with bland and simple strings to help them.
+
+ * "log --date=iso" uses a slight variant of ISO 8601 format that is
+   made more human readable.  A new "--date=iso-strict" option gives
+   datetime output that is more strictly conformant.
+
+ * A broken reimplementation of Git could write an invalid index that
+   records both stage #0 and higher stage entries for the same path.
+   We now notice and reject such an index, as there is no sensible
+   fallback (we do not know if the broken tool wanted to resolve and
+   forgot to remove higher stage entries, or if it wanted to unresolve
+   and forgot to remove the stage#0 entry).
+
+
 Performance, Internal Implementation, etc.
 
  * The API to manipulate the "refs" is currently undergoing a revamp
@@ -65,6 +83,10 @@ Performance, Internal Implementation, etc.
    "write-tree" (used in "commit") and "diff-index --cached" (used in
    "status").
 
+ * A common programming mistake to assign the same short option name
+   to two separate options is detected by parse_options() API to help
+   developers.
+
 
 Also contains various documentation updates and code clean-ups.
 
@@ -79,7 +101,6 @@ notes for details).
  * "git log --pretty/format=" with an empty format string did not
    mean the more obvious "No output whatsoever" but "Use default
    format", which was counterintuitive.
-   (merge b9c7d6e jk/pretty-empty-format later to maint).
 
  * Implementations of "tar" that do not understand an extended pax
    header would extract the contents of it in a regular file; make
@@ -89,44 +110,62 @@ notes for details).
  * "git -c section.var command" and "git -c section.var= command"
    should pass the configuration differently (the former should be a
    boolean true, the latter should be an empty string).
-   (merge a789ca7 jk/command-line-config-empty-string later to maint).
 
  * Applying a patch not generated by Git in a subdirectory used to
    check the whitespace breakage using the attributes for incorrect
    paths. Also whitespace checks were performed even for paths
    excluded via "git apply --exclude=<path>" mechanism.
-   (merge 477a08a jc/apply-ws-prefix later to maint).
 
  * "git bundle create" with date-range specification were meant to
    exclude tags outside the range, but it didn't.
-   (merge 2c8544a lf/bundle-exclusion later to maint).
 
  * "git add x" where x that used to be a directory has become a
    symbolic link to a directory misbehaved.
-   (merge ccad42d rs/refresh-beyond-symlink later to maint).
 
  * The prompt script checked $GIT_DIR/ref/stash file to see if there
    is a stash, which was a no-no.
-   (merge 0fa7f01 jk/prompt-stash-could-be-packed later to maint).
 
  * Pack-protocol documentation had a minor typo.
-   (merge 5d146f7 sp/pack-protocol-doc-on-shallow later to maint).
 
  * "git checkout -m" did not switch to another branch while carrying
    the local changes forward when a path was deleted from the index.
-   (merge 6a143aa jn/unpack-trees-checkout-m-carry-deletion later to maint).
 
  * With sufficiently long refnames, "git fast-import" could have
    overflown an on-stack buffer.
-   (merge c252785 jk/fast-import-fixes later to maint).
 
  * After "pack-refs --prune" packed refs at the top-level, it failed
    to prune them.
-   (merge afd11d3 jk/prune-top-level-refs-after-packing later to maint).
 
  * Progress output from "git gc --auto" was visible in "git fetch -q".
-   (merge 6fceed3 nd/fetch-pass-quiet-to-gc-child-process later to maint).
 
  * We used to pass -1000 to poll(2), expecting it to also mean "no
    timeout", which should be spelled as -1.
-   (merge 6c71f8b et/spell-poll-infinite-with-minus-one-only later to maint).
+
+ * "git rebase" documentation was unclear that it is required to
+   specify on what <upstream> the rebase is to be done when telling it
+   to first check out <branch>.
+   (merge 95c6826 so/rebase-doc later to maint).
+
+ * "git push" over HTTP transport had an artificial limit on number of
+   refs that can be pushed imposed by the command line length.
+   (merge 26be19b jk/send-pack-many-refspecs later to maint).
+
+ * When receiving an invalid pack stream that records the same object
+   twice, multiple threads got confused due to a race.
+   (merge ab791dd jk/index-pack-threading-races later to maint).
+
+ * An attempt to remove the entire tree in the "git fast-import" input
+   stream caused it to misbehave.
+   (merge 2668d69 mb/fast-import-delete-root later to maint).
+
+ * Reachability check (used in "git prune" and friends) did not add a
+   detached HEAD as a starting point to traverse objects still in use.
+   (merge c40fdd0 mk/reachable-protect-detached-head later to maint).
+
+ * "git config --add section.var val" used to lose existing
+   section.var whose value was an empty string.
+   (merge c1063be ta/config-add-to-empty-or-true-fix later to maint).
+
+ * "git fsck" failed to report that it found corrupt objects via its
+   exit status in some cases.
+   (merge 30d1038 jk/fsck-exit-code-fix later to maint).