remote: add promisor and partial clone config to the doc

Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config/remote.txt

diff --git a/Documentation/config/remote.txt b/Documentation/config/remote.txt
index 6c4cad8..a8e6437 100644
--- a/Documentation/config/remote.txt
+++ b/Documentation/config/remote.txt
@@ -76,3 +76,11 @@
 +
 See also `remote.<name>.prune` and the PRUNING section of
 linkgit:git-fetch[1].
+
+remote.<name>.promisor::
+	When set to true, this remote will be used to fetch promisor
+	objects.
+
+remote.<name>.partialclonefilter::
+	The filter that will be applied when fetching from this
+	promisor remote.