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>

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    283,
 /**/
     282,
 /**/