Rollup merge of #142452 - ChrisDenton:intermittent, r=Noratrieb

Remove "intermittent" wording from `ReadDir`

`ReadDir` claims that `next` will return an error "if there’s some sort of intermittent IO error during iteration". I'm really not sure what this was intended to mean but the implementations will simply return all OS errors encountered during iteration to the user. What else can they do?

This is technically a change in the documented API but seeing as how it doesn't bear any relationship with the implementation I don't think it needs a libs-api fcp.

Author: workingjubilee

library/std/src/fs.rs

@@ -153,9 +153,8 @@ pub struct Metadata(fs_imp::FileAttr);
 /// dependent.
 ///
 /// # Errors
-///
-/// This [`io::Result`] will be an [`Err`] if there's some sort of intermittent
-/// IO error during iteration.
+/// This [`io::Result`] will be an [`Err`] if an error occurred while fetching
+/// the next entry from the OS.
 #[stable(feature = "rust1", since = "1.0.0")]
 #[derive(Debug)]
 pub struct ReadDir(fs_imp::ReadDir);