btrfs-progs: docs: add 6.5 development statistics

Signed-off-by: David Sterba <[email protected]>

Author: kdave

Documentation/Contributors.rst

@@ -27,6 +27,7 @@ Statistics for 6.x series
     "6.2", "23", "111898", "161197", "289", "+11693 -9780"
     "6.3", "19", "111615", "160912", "150", "+2824 -3108"
     "6.4", "18", "110224", "159150", "180", "+3118 -4879"
+    "6.5", "19", "110377", "159415", "230", "+3193 -2928"
 
 
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