[PATCH] config: correct and clarify core.*compression documentation

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* core.loosecompression stated that the default was "0 (best speed)",
  when in fact 0 is "no compression", and the default is Z_BEST_SPEED,
  which is 1.

* Explain that the default of core.compression is -1, zlib default, and
  add a quote from zlib.h explaining what that actually means.
---
  applies to 'maint'; unfortunately I just noticed 1.5.3.6 went out.

 Documentation/config.txt |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 7ee97df..d62a72b 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -226,13 +226,16 @@ core.compression::
 	An integer -1..9, indicating a default compression level.
 	-1 is the zlib default. 0 means no compression,
 	and 1..9 are various speed/size tradeoffs, 9 being slowest.
+	If not set, defaults to -1 (zlib default), which is "a default
+	compromise between speed and compression (currently equivalent
+	to level 6)."
 
 core.loosecompression::
 	An integer -1..9, indicating the compression level for objects that
 	are not in a pack file. -1 is the zlib default. 0 means no
 	compression, and 1..9 are various speed/size tradeoffs, 9 being
 	slowest.  If not set,  defaults to core.compression.  If that is
-	not set,  defaults to 0 (best speed).
+	not set,  defaults to 1 (best speed).
 
 core.packedGitWindowSize::
 	Number of bytes of a pack file to map into memory in a
-- 
1.5.3.5.1824.g5f389
-
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