Documentation: do not nest open blocks

It appears we try to nest open blocks, but that does not work well with
Asciidoctor, which fails to indent the inner blocks. As a result, they
do not visually seem to relate (as much) to the preceding paragraph as
they should. Drop the outer blocks to fix the rendering of the inner
ones. Asciidoc renders identically before and after this patch, both
man-pages and html.

This also makes Asciidoctor stop rendering a literal '+' before "Under
--pretty=oneline ..." in the manuals for git-log and git-rev-list.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-init.txt

@@ -38,8 +38,6 @@ the repository to another place if --separate-git-dir is given).
 OPTIONS
 -------
 
---
-
 -q::
 --quiet::
 
@@ -111,8 +109,6 @@ into it.
 If you provide a 'directory', the command is run inside it. If this directory
 does not exist, it will be created.
 
---
-
 TEMPLATE DIRECTORY
 ------------------
 

Documentation/rev-list-options.txt

@@ -13,8 +13,6 @@ has a line that matches `<pattern>`), unless otherwise noted.
 Note that these are applied before commit
 ordering and formatting options, such as `--reverse`.
 
---
-
 -<number>::
 -n <number>::
 --max-count=<number>::
@@ -308,8 +306,6 @@ ifdef::git-rev-list[]
 	`<header>` text will be printed with each progress update.
 endif::git-rev-list[]
 
---
-
 History Simplification
 ~~~~~~~~~~~~~~~~~~~~~~