Fix a typo

Author: chasenlehara

docs/helpers.md

@@ -1,7 +1,7 @@
 @property {Object.<String,can-stache.helper>} can-component.prototype.helpers helpers
 @parent can-component.deprecated
 
-@deprecated {4.0} Add methods to your componentt’s ViewModel instead. See [can-stache can-stache] [can-stache#Creatinghelpers can-stache’s “creating helpers” documentation] for more information.
+@deprecated {4.0} Add methods to your component’s ViewModel instead. See [can-stache can-stache] [can-stache#Creatinghelpers can-stache’s “creating helpers” documentation] for more information.
 
 @description Helper functions used with the component’s view.