Revert "Document PAGE.String"

This reverts commit bb30e7c08f.

We don't want to document this, at least not this way.

The PAGE.String method is currently meant to be used to give contextual information about a page (path, filename).

It's meant for error messages, so you can do

```
{{ warnf "foo not found in %q" .Page }}
```

But when documented as "Returns the absolute path to the file backing the given page", that is

1. Not entirely correct.
2. Makes it a formal API that people will use as a filename/path, and we can never change it (e.g. to add more contextual information)

content/en/methods/page/Store.md

@@ -1,5 +1,6 @@
 ---
 title: Store
+linktitle: PAGE.Store
 description: Returns a persistent "scratch pad" on the given page to store and manipulate data.
 categories: []
 keywords: []

content/en/methods/page/String.md

@@ -1,45 +0,0 @@
----
-title: String
-description: Returns the absolute path to the file backing the given page.
-categories: []
-keywords: []
-action:
-  related: []
-  returnType: string
-  signatures: [PAGE.String]
-toc: true
----
-
-{{< new-in 0.137.0 >}}
-
-With content from the file system:
-
-```go-html-template
-{{ .String }} → /home/user/project/content/posts/post-1.md
-```
-
-With content from a content adapter:
-
-```go-html-template
-{{ .String }} → /home/user/project/content/posts/_content.gotmpl:/posts/post-1.md
-```
-
-With content from a module:
-
-```go-html-template
-{{ .String }}  → /home/user/.cache/hugo_cache/modules/filecache/modules/pkg/mod/github.com/user/hugo-module-content@v0.1.9/content/posts/post-1.md
-```
-
-Use this method to provide useful information when displaying error and warning messages in the console:
-
-{{< code file="layouts/partials/featured-image.html" lang="go-html-template" >}}
-{{ with .Resources.GetMatch "*featured*" }}
-  {{ with .Resize "300x webp" }}
-    <img src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
-  {{ end }}
-{{ else }}
-  {{ errorf "The featured-image partial was unable to find a featured image. See %s" .String }}
-{{ end }}
-{{< /code >}}
-
-With shortcodes and render hooks use the `Position` method instead. Note that the `Position` method is not available to heading, image, and link render hooks.