proposal of 'allow listing' as an inclusive alternative to 'whitelisting' (#956)

* proposoal of 'allow listing' as an inclusive alternative to 'whitelisting'

* Update src/guide/migration/introduction.md

Co-authored-by: skirtle <[email protected]>

* Update src/guide/migration/custom-elements-interop.md

Co-authored-by: skirtle <[email protected]>

* Update src/guide/template-syntax.md

Co-authored-by: skirtle <[email protected]>

* Update src/guide/migration/custom-elements-interop.md

Co-authored-by: skirtle <[email protected]>

Co-authored-by: skirtle <[email protected]>

Author: joaomelo

src/guide/migration/custom-elements-interop.md

@@ -7,7 +7,7 @@ badges:
 
 ## Overview
 
-- **BREAKING:** Custom elements whitelisting is now performed during template compilation, and should be configured via compiler options instead of runtime config.
+- **BREAKING:** The checks to determine whether tags should be treated as custom elements are now performed during template compilation, and should be configured via compiler options instead of runtime config.
 - **BREAKING:** Special `is` prop usage is restricted to the reserved `<component>` tag only.
 - **NEW:** There is new `v-is` directive to support 2.x use cases where `is` was used on native elements to work around native HTML parsing restrictions.
 
@@ -21,7 +21,7 @@ If we want to add a custom element defined outside of Vue (e.g. using the Web Co
 
 ### 2.x Syntax
 
-In Vue 2.x, whitelisting tags as custom elements was done via `Vue.config.ignoredElements`:
+In Vue 2.x, configuring tags as custom elements was done via `Vue.config.ignoredElements`:
 
 ```js
 // This will make Vue ignore custom element defined outside of Vue

src/guide/migration/introduction.md

@@ -89,7 +89,7 @@ The following consists a list of breaking changes from 2.x:
 
 ### Custom Elements
 
-- [Custom elements whitelisting is now performed during template compilation](/guide/migration/custom-elements-interop.html)
+- [Custom element checks are now performed during template compilation](/guide/migration/custom-elements-interop.html)
 - [Special `is` prop usage is restricted to the reserved `<component>` tag only](/guide/migration/custom-elements-interop.html#customized-built-in-elements)
 
 ### Other Minor Changes

src/guide/template-syntax.md

@@ -206,4 +206,4 @@ Unless you have a "someattr" property in your instance, your code won't work.
 
 #### JavaScript Expressions
 
-Template expressions are sandboxed and only have access to a [whitelist of globals](https://github.com/vuejs/vue-next/blob/master/packages/shared/src/globalsWhitelist.ts#L3) such as `Math` and `Date`. You should not attempt to access user defined globals in template expressions.
+Template expressions are sandboxed and only have access to a [restricted list of globals](https://github.com/vuejs/vue-next/blob/master/packages/shared/src/globalsWhitelist.ts#L3) such as `Math` and `Date`. You should not attempt to access user defined globals in template expressions.