fix typo in comments

Author: etpinard

src/traces/histogram/index.js

@@ -12,7 +12,7 @@
 /**
  * Histogram has its own attribute, defaults and calc steps,
  * but uses bar's plot to display
- * and bar's crossTraceCalc (formally known as setPositions) for stacking and grouping
+ * and bar's crossTraceCalc (formerly known as setPositions) for stacking and grouping
  */
 
 /**

test/jasmine/tests/bar_test.js

@@ -171,7 +171,7 @@ describe('Bar.supplyDefaults', function() {
     });
 });
 
-describe('bar calc / crossTraceCalc (formally known as setPositions)', function() {
+describe('bar calc / crossTraceCalc (formerly known as setPositions)', function() {
     'use strict';
 
     it('should fill in calc pt fields (stack case)', function() {
@@ -337,7 +337,7 @@ describe('Bar.calc', function() {
     });
 });
 
-describe('Bar.crossTraceCalc (formally known as setPositions)', function() {
+describe('Bar.crossTraceCalc (formerly known as setPositions)', function() {
     'use strict';
 
     it('should guard against invalid offset items', function() {