Documentation/RelNotes: remove "updated up to this revision" markers

These were used to keep track of the last commit a release notes
entry was written for, and should have been removed when cutting
the final release.

Signed-off-by: Thomas Ackermann <th.acker@arcor.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/RelNotes/1.5.2.1.txt

@@ -45,9 +45,3 @@ Fixes since v1.5.2
   - git-fastimport --import-marks was broken; fixed.
 
   - A lot of documentation updates, clarifications and fixes.
-
---
-exec >/var/tmp/1
-O=v1.5.2-65-g996e2d6
-echo O=`git describe refs/heads/maint`
-git shortlog --no-merges $O..refs/heads/maint

Documentation/RelNotes/1.6.0.2.txt

@@ -79,9 +79,3 @@ Fixes since v1.6.0.1
   packfile.
 
 Also contains many documentation updates.
-
---
-exec >/var/tmp/1
-O=v1.6.0.1-78-g3632cfc
-echo O=$(git describe maint)
-git shortlog --no-merges $O..maint

Documentation/RelNotes/1.6.1.3.txt

@@ -26,7 +26,3 @@ Fixes since v1.6.1.2
 * RPM binary package installed the html manpages in a wrong place.
 
 Also includes minor documentation fixes and updates.
-
-
---
-git shortlog --no-merges v1.6.1.2-33-gc789350..

Documentation/RelNotes/1.6.1.4.txt

@@ -39,6 +39,3 @@ Fixes since v1.6.1.3
   This fix was first merged to 1.6.2.3.
 
 Also includes minor documentation fixes and updates.
-
---
-git shortlog --no-merges v1.6.1.3..

Documentation/RelNotes/1.6.1.txt

@@ -278,9 +278,3 @@ release, unless otherwise noted.
 
 * "gitweb" did not mark non-ASCII characters imported from external HTML fragments
   correctly.
-
---
-exec >/var/tmp/1
-O=v1.6.1-rc3-74-gf66bc5f
-echo O=$(git describe master)
-git shortlog --no-merges $O..master ^maint