patch 9.1.0282: Several small issues in doc and tests

Problem:  Wrong doc style for pandoc syntax description,
          Test_diff_eob_halfpage() may fail depending on
          screen size, using braces in highlight.c when
          not necessary
Solution: Fix pandoc documentation, make sure the window
          for the test has 7 lines, remove the braces.

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/testdir/test_diffmode.vim b/src/testdir/test_diffmode.vim
index 9e973de..f28e840 100644
--- a/src/testdir/test_diffmode.vim
+++ b/src/testdir/test_diffmode.vim
Binary files differ