Fix: Feedback title/altTitle documentation and schema updates. (#166)

* Fix: Feedback title/altTitle documentation and schema updates.

* altTitle schema description amended.

README.md

@@ -94,7 +94,9 @@ guide the learner’s interaction with the component.
 **\_feedback** (object): If the [**Tutor** extension](https://github.com/adaptlearning/adapt-contrib-tutor) is enabled, these various texts will be displayed depending on the submitted answer. **\_feedback**
 contains values for three types of answers: **correct**, **\_incorrect**, and **\_partlyCorrect**. Some attributes are optional. If they are not supplied, the default that is noted below will be used.
 
->**title** (string): If not set, the component's **displayTitle** is used as the feedback title. If **displayTitle** is not set , **title** will be used instead.
+>**title** (string): Title text for the feedback that will be displayed when the question is submitted.
+
+>**altTitle** (string): This will be read out by screen readers as an alternative heading if no visual heading is included.
 
 >**correct** (string): Text that will be displayed when the submitted answer is correct.
 

example.json

@@ -47,6 +47,7 @@
         ],
         "_feedback":{
             "title": "Feedback title",
+            "altTitle": "Alt feedback text",
             "correct": "Congratulations, this is the correct feedback.",
             "_incorrect": {
                 "notFinal": "",

schema/component.schema.json

@@ -201,7 +201,16 @@
             "title": {
               "type": "string",
               "title": "Title",
-              "description": "Leave blank to have the component's title shown instead",
+              "description": "Title text for the feedback",
+              "default": "",
+              "_adapt": {
+                "translatable": true
+              }
+            },
+            "altTitle": {
+              "type": "string",
+              "title": "Alternative Feedback Title",
+              "description": "Text read out by screen readers if no visual title is included",
               "default": "",
               "_adapt": {
                 "translatable": true