fix upperfence description

Author: archmoj

src/traces/box/attributes.js

@@ -129,7 +129,7 @@ module.exports = {
             'There should be as many items as the number of boxes desired.',
             'This attribute has effect only under the q1/median/q3 signature.',
             'If `upperfence` is not provided but a sample (in `y` or `x`) is set,',
-            'we compute the lower as the last sample point above 1.5 times the IQR.'
+            'we compute the upper as the last sample point above 1.5 times the IQR.'
         ].join(' ')
     },
 

test/plot-schema.json

@@ -17275,7 +17275,7 @@
      "role": "object"
     },
     "upperfence": {
-     "description": "Sets the upper fence values. There should be as many items as the number of boxes desired. This attribute has effect only under the q1/median/q3 signature. If `upperfence` is not provided but a sample (in `y` or `x`) is set, we compute the lower as the last sample point above 1.5 times the IQR.",
+     "description": "Sets the upper fence values. There should be as many items as the number of boxes desired. This attribute has effect only under the q1/median/q3 signature. If `upperfence` is not provided but a sample (in `y` or `x`) is set, we compute the upper as the last sample point above 1.5 times the IQR.",
      "editType": "calc",
      "valType": "data_array"
     },