Rollup merge of #85760 - ChrisDenton:path-doc-platform-specific, r=m-ou-se

Possible errors when accessing file metadata are platform specific

In particular the `is_dir`, `is_file` and `exists` functions suggests that querying a file requires querying the directory. On Windows this is not normally true.

r? `@m-ou-se`

library/std/src/path.rs

@@ -2486,10 +2486,10 @@ impl Path {
     /// Returns `true` if the path points at an existing entity.
     ///
     /// This function will traverse symbolic links to query information about the
-    /// destination file. In case of broken symbolic links this will return `false`.
+    /// destination file.
     ///
-    /// If you cannot access the directory containing the file, e.g., because of a
+    /// If you cannot access the metadata of the file, e.g. because of a
-    /// permission error, this will return `false`.
+    /// permission error or broken symbolic links, this will return `false`.
     ///
     /// # Examples
     ///
@@ -2537,10 +2537,10 @@ impl Path {
     /// Returns `true` if the path exists on disk and is pointing at a regular file.
     ///
     /// This function will traverse symbolic links to query information about the
-    /// destination file. In case of broken symbolic links this will return `false`.
+    /// destination file.
     ///
-    /// If you cannot access the directory containing the file, e.g., because of a
+    /// If you cannot access the metadata of the file, e.g. because of a
-    /// permission error, this will return `false`.
+    /// permission error or broken symbolic links, this will return `false`.
     ///
     /// # Examples
     ///
@@ -2569,10 +2569,10 @@ impl Path {
     /// Returns `true` if the path exists on disk and is pointing at a directory.
     ///
     /// This function will traverse symbolic links to query information about the
-    /// destination file. In case of broken symbolic links this will return `false`.
+    /// destination file.
     ///
-    /// If you cannot access the directory containing the file, e.g., because of a
+    /// If you cannot access the metadata of the file, e.g. because of a
-    /// permission error, this will return `false`.
+    /// permission error or broken symbolic links, this will return `false`.
     ///
     /// # Examples
     ///