Update api spec (#818)

YOYO NEW API SPEC!

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spec.json

@@ -21706,7 +21706,7 @@
                 }
               },
               "padding": {
-                "description": "How much to pad the view frame by.",
+                "description": "How much to pad the view frame by, as a fraction of the object(s) bounding box size. Negative padding will crop the view of the object proportionally. e.g. padding = 0.2 means the view will span 120% of the object(s) bounding box, and padding = -0.2 means the view will span 80% of the object(s) bounding box.",
                 "type": "number",
                 "format": "float"
               },