Documentation: adjust to AsciiDoc 8

It turns out that the attribute definition we have had for a
long time to hide "^" character from AsciiDoc 7 was not honored
by AsciiDoc 8 even under "-a asciidoc7compatible" mode.  There is
a similar breakage with the "compatible" mode with + characters.

The double colon at the end of definition list term needs
to be attached to the term, without a whitespace.  After this
minimum fixups, AsciiDoc 8 (I used 8.2.1 on Debian) with
compatibility mode seems to produce reasonably good results.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/Makefile

@@ -37,6 +37,9 @@ man7dir=$(mandir)/man7
 
 ASCIIDOC=asciidoc
 ASCIIDOC_EXTRA =
+ifdef ASCIIDOC8
+ASCIIDOC_EXTRA += -a asciidoc7compatible
+endif
 INSTALL?=install
 DOC_REF = origin/man
 

Documentation/asciidoc.conf

@@ -8,7 +8,8 @@
 # the command.
 
 [attributes]
-caret=^
+plus=+
+caret=^
 startsb=[
 endsb=]
 tilde=~

Documentation/git-cvsexportcommit.txt

@@ -73,7 +73,7 @@ $ git-cvsexportcommit -v <commit-sha1>
 $ cvs commit -F .mgs <files> 
 ------------
 
-Merge pending patches into CVS automatically -- only if you really know what you are doing ::
+Merge pending patches into CVS automatically -- only if you really know what you are doing::
 +
 ------------
 $ export GIT_DIR=~/project/.git

Documentation/user-manual.txt

@@ -2757,8 +2757,8 @@ As a result, the general consistency of an object can always be tested
 independently of the contents or the type of the object: all objects can
 be validated by verifying that (a) their hashes match the content of the
 file and (b) the object successfully inflates to a stream of bytes that
-forms a sequence of <ascii type without space> + <space> + <ascii decimal
-size> + <byte\0> + <binary object data>. 
+forms a sequence of <ascii type without space> {plus} <space> {plus} <ascii decimal
+size> {plus} <byte\0> {plus} <binary object data>.
 
 The structured objects can further have their structure and
 connectivity to other objects verified. This is generally done with

Makefile

@@ -107,6 +107,8 @@ all::
 # Define USE_STDEV below if you want git to care about the underlying device
 # change being considered an inode change from the update-cache perspective.
 #
+# Define ASCIIDOC8 if you want to format documentation with AsciiDoc 8
+#
 # Define NO_PERL_MAKEMAKER if you cannot use Makefiles generated by perl's
 # MakeMaker (e.g. using ActiveState under Cygwin).
 #
@@ -689,6 +691,10 @@ ifndef V
 endif
 endif
 
+ifdef ASCIIDOC8
+	export ASCIIDOC8
+endif
+
 # Shell quote (do not use $(call) to accommodate ancient setups);
 
 SHA1_HEADER_SQ = $(subst ','\'',$(SHA1_HEADER))