fix: Bone Devil CR, XP, passive perception (#531)

Fix transposed numbers on the Bone Devil monster entry, and a typo.

Author: oznogon

src/5e-SRD-Monsters.json

@@ -9533,11 +9533,11 @@
     ],
     "senses": {
       "darkvision": "120 ft.",
-      "passive_perception": 9
+      "passive_perception": 12
     },
     "languages": "Infernal, telepathy 120 ft.",
-    "challenge_rating": 12,
-    "xp": 8400,
+    "challenge_rating": 9,
+    "xp": 5000,
     "special_abilities": [
       {
         "name": "Devil's Sight",
@@ -9583,7 +9583,7 @@
       },
       {
         "name": "Sting",
-        "desc": "Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 17 (5d6) poison damage, and the target must succeed on a DC 14 Constitution saving throw or become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success .",
+        "desc": "Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 4) piercing damage plus 17 (5d6) poison damage, and the target must succeed on a DC 14 Constitution saving throw or become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.",
         "attack_bonus": 8,
         "damage": [
           {