Editorial: ensure consistency in manifest naming (#1099)

Co-authored-by: Marcos Cáceres <[email protected]>

README.md

@@ -1,9 +1,9 @@
-This repository is the home of the :star: **[Web App Manifest](https://www.w3.org/TR/appmanifest/)** :star: specification being worked on by
+This repository is the home of the :star: **[Web Application Manifest](https://www.w3.org/TR/appmanifest/)** :star: specification being worked on by
 the [Web Applications Working Group](https://www.w3.org/2019/webapps/).
 
 ## Useful links
 * [Explainer](https://github.com/w3c/manifest/blob/gh-pages/explainer.md)
-* [The Web App Manifest specification](https://www.w3.org/TR/appmanifest/)
+* [The Web Application Manifest specification](https://www.w3.org/TR/appmanifest/)
 * [App Information supplement](https://github.com/w3c/manifest-app-info)
 * [Use cases and requirements](https://w3c-webmob.github.io/installable-webapps/)
 * [The Web Applications WG homepage](https://www.w3.org/2019/webapps/)

explainer.md

@@ -123,7 +123,7 @@ If you omit the icons, the browser just falls back to looking for `<link rel="ic
 
 TBW.
 
-More information about purpose can be found in the [Web App Manifest spec](https://www.w3.org/TR/appmanifest/#purpose-member).
+More information about purpose can be found in the [Web Application Manifest spec](https://www.w3.org/TR/appmanifest/#purpose-member).
 
 ## Display modes and orientation
 Apps need to be able to control how they are to be displayed when they start-up. If it’s a game, it might need to be in full-screen and possibly in landscape mode. In order to do this, the manifest format provides you with two properties.
@@ -284,9 +284,9 @@ The manifest, and Progressive Web Apps are implemented in Chrome, Opera, and Sam
 
 ## Interaction with Web Crawlers
 
-Like other web resources, a web app manifest should be accessible to any web browser or web crawler.
+Like other web resources, a web application manifest should be accessible to any web browser or web crawler.
 
-If a web app developer wants to inform web crawlers of a desire for the file not to be crawled, the developer MAY do so by including the web app manifest in a robots.txt file.
+If a web app developer wants to inform web crawlers of a desire for the file not to be crawled, the developer MAY do so by including the web application manifest in a robots.txt file.
 This is further described in the [robots.txt](http://www.robotstxt.org/) protocol.
 A web app developer could also use the `X-Robots-Tag` HTTP header.
 

index.html

@@ -3059,12 +3059,12 @@ <h2>
         Application Information
       </h2>
       <p>
-        Several members of the Web App Manifest provide additional metadata
-        related to how the web application may be presented in the context of a
-        digital storefront, installation dialog, or other surfaces where the
-        web application may be marketed or distributed. In an effort to support
-        these use cases better, the following members have been moved into
-        [[[manifest-app-info]]]:
+        Several members of the Web Application Manifest provide additional
+        metadata related to how the web application may be presented in the
+        context of a digital storefront, installation dialog, or other surfaces
+        where the web application may be marketed or distributed. In an effort
+        to support these use cases better, the following members have been
+        moved into [[[manifest-app-info]]]:
       </p>
       <ul>
         <li>`categories`