[PATCH 2/3] doc: document the special handling of -l0

From: Elijah Newren <redacted>

As noted in commit 89973554b52c (diffcore-rename: make diff-tree -l0
mean -l<large>, 2017-11-29), -l0 has had a magical special "large"
historical value associated with it.  Document this value, particularly
since it is not large enough for some uses -- see commit 9f7e4bfa3b6d
(diff: remove silent clamp of renameLimit, 2017-11-13).

Signed-off-by: Elijah Newren <redacted>
---
 Documentation/diff-options.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index b5682b83956..17c8455b908 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt

@@ -595,6 +595,9 @@ of a delete/create pair.
 	specified number.  Defaults to diff.renameLimit, or if that is
 	also unspecified, to 400.
 
+	Note that for backward compatibility reasons, a value of 0 is treated
+	the same as if 32767 was passed.
+
 ifndef::git-format-patch[]
 --diff-filter=[(A|C|D|M|R|T|U|X|B)...[*]]::
 	Select only files that are Added (`A`), Copied (`C`),

-- 
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