[PATCH v2] archive: rewrite description for compression level option

Rewrite the description of `-#` option. Since the option is also
supported on tar archive, move to OPTIONS section and remove EXTRA.

Signed-off-by: Bagas Sanjaya <redacted>
---
 Changes since v1 [1]:
     - Mention common levels (store-only, fastest time, and best
       compression).
     - Note that compression level option is supported by both zip and
       tar format, so move the description to OPTIONS section.

 [1]: https://lore.kernel.org/git/xmqqpms6akup.fsf@gitster.g/T/#t

 Documentation/git-archive.txt | 24 ++++++++----------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/Documentation/git-archive.txt b/Documentation/git-archive.txt
index 9f8172828d..9aecc0936c 100644
--- a/Documentation/git-archive.txt
+++ b/Documentation/git-archive.txt

@@ -9,7 +9,7 @@ git-archive - Create an archive of files from a named tree
 SYNOPSIS
 --------
 [verse]
-'git archive' [--format=<fmt>] [--list] [--prefix=<prefix>/] [<extra>]
+'git archive' [--format=<fmt>] [--list] [--prefix=<prefix>/] [-#]
 	      [-o <file> | --output=<file>] [--worktree-attributes]
 	      [--remote=<repo> [--exec=<git-upload-archive>]] <tree-ish>
 	      [<path>...]

@@ -65,10 +65,6 @@ OPTIONS
 	Look for attributes in .gitattributes files in the working tree
 	as well (see <<ATTRIBUTES>>).
 
-<extra>::
-	This can be any options that the archiver backend understands.
-	See next section.
-
 --remote=<repo>::
 	Instead of making a tar archive from the local repository,
 	retrieve a tar archive from a remote repository. Note that the

@@ -88,17 +84,13 @@ OPTIONS
 	of the current working directory are included in the archive.
 	If one or more paths are specified, only these are included.
 
-BACKEND EXTRA OPTIONS
----------------------
-
-zip
-~~~
--0::
-	Store the files instead of deflating them.
--9::
-	Highest and slowest compression level.  You can specify any
-	number from 1 to 9 to adjust compression speed and ratio.
-
+-#::
+	Select the compression level. The supported levels and default
+	value (if none is selected) are depending on compression command
+	backend configured for the selected format (either explicitly with
+	`--format` or inferred from file name specified with `-o`). Common
+	values are `-0` for only storing files (zip only), `-1` for fastest
+	compression time, and `-9` for best compression ratio.