[PATCH v2 3/3] doc: add a short explanation for git-repack options

[Damien Robert <damien.olivier.robert@gmail.com>]

For some git-repack options passed on to git-pack-objects, there was
only a link to git-pack-objects(1). Add a short documentation explaining
their meaning so that the reader does not have to consult another man
page.

We also explain that unreachable objects are not packed.

Signed-off-by: Damien Robert <damien.olivier.robert+git@gmail.com>
---
 Documentation/git-repack.txt | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-repack.txt b/Documentation/git-repack.txt
index 0962562c17..8f7f1140c3 100644
--- a/Documentation/git-repack.txt
+++ b/Documentation/git-repack.txt
@@ -14,9 +14,9 @@ SYNOPSIS
 DESCRIPTION
 -----------
 
-This command is used to combine all objects that do not currently
-reside in a "pack", into a pack.  It can also be used to re-organize
-existing packs into a single, more efficient pack.
+This command is used to combine all objects (except unreachable ones) that
+do not currently reside in a "pack", into a pack.  It can also be used to
+re-organize existing packs into a single, more efficient pack.
 
 A pack is a collection of objects, individually compressed, with
 delta compression applied, stored in a single file, with an
@@ -66,18 +66,27 @@ to the new separate pack will be written.
 -l::
 	Pass the `--local` option to 'git pack-objects'. See
 	linkgit:git-pack-objects[1].
+	This causes an object that is borrowed from an alternate
+	object store to be ignored even if it would have otherwise been
+	packed.
 
 -f::
 	Pass the `--no-reuse-delta` option to `git pack-objects`, see
 	linkgit:git-pack-objects[1].
+	The repack will not reuse existing deltas but compute them from
+	scratch.
 
 -F::
 	Pass the `--no-reuse-object` option to `git pack-objects`, see
 	linkgit:git-pack-objects[1].
+	The repack will not reuse existing object data at all, including
+	non deltified object, forcing recompression of everything.
 
 -q::
 	Pass the `-q` option to 'git pack-objects'. See
 	linkgit:git-pack-objects[1].
+	This flag makes the command not to report its progress
+	on the standard error stream.
 
 -n::
 	Do not update the server information with
-- 
Patched on top of v2.26.0-rc1-6-ga56d361f66 (git version 2.25.1)