documentation: retire unfinished documentation

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 9705b94b229c348cb806da54ad778acc84164acd..aba7568bcded1c5c35c779374e616282862b598c 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1409,7 +1409,9 @@ gc.pruneExpire::
        Override the grace period with this config variable.  The value
        "now" may be used to disable this grace period and always prune
        unreachable objects immediately, or "never" may be used to
-       suppress pruning.
+       suppress pruning.  This feature helps prevent corruption when
+       'git gc' runs concurrently with another process writing to the
+       repository; see the "NOTES" section of linkgit:git-gc[1].
 
 gc.worktreePruneExpire::
        When 'git gc' is run, it calls