completion: make sed command that generates config-list.h portable.

The OpenBSD 'sed' command does not support '\n' to represent newlines in
sed expressions. This leads to the follow compiler error:

    In file included from builtin/help.c:15:
    ./config-list.h:282:18: error: use of undeclared identifier 'n'
            "gitcvs.dbUser",n       "gitcvs.dbPass",
                            ^
    1 error generated.
    gmake: *** [Makefile:2821: builtin/help.o] Error 1

We can fix this by documenting related configuration variables
one-per-line instead of listing them separated by commas. This allows us
to remove the unportable part of the sed expression in
generate-configlist.sh.

Signed-off-by: Collin Funk <collin.funk1@gmail.com>
Reviewed-by: Jacob Keller <jacob.keller@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config/gitcvs.adoc

@@ -47,7 +47,8 @@ gitcvs.dbDriver::
 	May not contain double colons (`:`). Default: 'SQLite'.
 	See linkgit:git-cvsserver[1].
 
-gitcvs.dbUser, gitcvs.dbPass::
+gitcvs.dbUser::
+gitcvs.dbPass::
 	Database user and password. Only useful if setting `gitcvs.dbDriver`,
 	since SQLite has no concept of database users and/or passwords.
 	'gitcvs.dbUser' supports variable substitution (see

Documentation/config/http.adoc

@@ -289,7 +289,8 @@ for most push problems, but can increase memory consumption
 significantly since the entire buffer is allocated even for small
 pushes.
 
-http.lowSpeedLimit, http.lowSpeedTime::
+http.lowSpeedLimit::
+http.lowSpeedTime::
 	If the HTTP transfer speed, in bytes per second, is less than
 	'http.lowSpeedLimit' for longer than 'http.lowSpeedTime' seconds,
 	the transfer is aborted.

generate-configlist.sh

@@ -19,7 +19,6 @@ EOF
 	s/::$//;
 	s/`//g;
 	s/^.*$/	"&",/;
-	s/,  */",\n	"/g;
 	p;};
 d' \
 	    "$SOURCE_DIR"/Documentation/*config.adoc \