Documentation/git-merge.txt: fix formatting of example block

You need at least four dashes in a line to have it recognized as listing
block delimiter by asciidoc.

Signed-off-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'maint-1.8.2' into maint-1.8.3

* maint-1.8.2:
  Documentation/git-merge.txt: fix formatting of example block
Merge branch 'maint-1.8.3' into maint

* maint-1.8.3:
  Documentation/git-merge.txt: fix formatting of example block
Merge branch 'hv/config-from-blob' into maint

Compilation fix on platforms with fgetc() and friends defined as
macros.

* hv/config-from-blob:
  config: do not use C function names as struct members
Merge branch 'nd/fetch-pack-shallow-fix' into maint

The recent "short-cut clone connectivity check" topic broke a shallow
repository when a fetch operation tries to auto-follow tags.

* nd/fetch-pack-shallow-fix:
  fetch-pack: do not remove .git/shallow file when --depth is not specified
Sync with maint

* maint:
  Documentation/git-merge.txt: fix formatting of example block