Change chrome://flags to about://flags in help text (#4502)

* Change chrome://flags to about://flags in help text

* Also change it in the intent templates and goldens

client-src/elements/form-field-specs.ts

@@ -1926,7 +1926,7 @@ export const ALL_FIELDS: Record<string, Field> = {
     attrs: TEXT_FIELD_ATTRS,
     required: false,
     label: 'Flag name',
-    help_text: html` Name of the flag on chrome://flags that allows a web
+    help_text: html` Name of the flag on about://flags that allows a web
       developer to enable this feature in their own browser to try it out. E.g.,
       "storage-buckets". These are defined in
       <a

internals/testdata/notifier_test/test_make_intent_email.html

@@ -103,7 +103,7 @@ No
 
 
 
-<br><br><h4>Flag name on chrome://flags</h4>
+<br><br><h4>Flag name on about://flags</h4>
 None
 
 <br><br><h4>Finch feature name</h4>

pages/testdata/intentpreview_test/test_html_rendering.html

@@ -258,7 +258,7 @@ Yes
 
 
 
-<br><br><h4>Flag name on chrome://flags</h4>
+<br><br><h4>Flag name on about://flags</h4>
 None
 
 <br><br><h4>Finch feature name</h4>

templates/blink/intent_to_implement.html

@@ -179,7 +179,7 @@
      >{{feature.devtrial_instructions}}</a>
 {% endif %}
 
-<br><br><h4>Flag name on chrome://flags</h4>
+<br><br><h4>Flag name on about://flags</h4>
 {{feature.flag_name}}
 
 <br><br><h4>Finch feature name</h4>