Apply suggestions from code review

Co-authored-by: Cameron DeCoster <cameron.decoster@gmail.com>

Author: emilykl

src/plots/cartesian/dragbox.js

@@ -733,7 +733,7 @@ function makeDragBox(gd, plotinfo, x, y, w, h, ns, ew) {
                 var axListI = axList[i];
                 var axListIType = axListI[axisType];
                 var axId = axListIType._id;
-                if(!axListI.fixedrange && axListIType.tickmode === 'sync' && activeAxIds.indexOf(axId) === -1) {
+                if(!axListI.fixedrange && axListIType.tickmode === 'sync' && !activeAxIds.includes(axId)) {
                     activeAxIds.push(axId);
                 }
             }

src/plots/cartesian/layout_attributes.js

@@ -36,7 +36,7 @@ var tickmode = extendFlat({}, minorTickmode, {
         minorTickmode.description,
         'If *sync*, the number of ticks will sync with the overlayed axis',
         'set by `overlaying` property. When no other tick info is provided,',
-        'overlyaing (non-categorical) axes default to *sync*, while other axes default to *auto*.',
+        'overlaying (non-categorical) axes default to *sync*, while other axes default to *auto*.',
     ].join(' ')
 });
 

src/plots/cartesian/tick_value_defaults.js

@@ -5,7 +5,7 @@ var isArrayOrTypedArray = require('../../lib').isArrayOrTypedArray;
 var isTypedArraySpec = require('../../lib/array').isTypedArraySpec;
 var decodeTypedArraySpec = require('../../lib/array').decodeTypedArraySpec;
 
-module.exports = function handleTickValueDefaults(containerIn, containerOut, coerce, axType, opts) {
+module.exports = function handleTickValueDefaults(containerIn, containerOut, coerce, axType, opts = {}) {
     if (!opts) opts = {};
     var isMinor = opts.isMinor;
     var cIn = isMinor ? containerIn.minor || {} : containerIn;