Rollup merge of #42685 - Havvy:doc-remove-sometimes, r=steveklabnik

Remove sometimes in std::io::Read doc

We use it immediately in the next sentence, and the word is filler.

A different conversation to make is whether we want to call them Readers in the documentation at all. And whether it's actually called "Readers" elsewhere.

Author: frewsxcv

src/libstd/io/mod.rs

@@ -389,7 +389,7 @@ fn read_to_end<R: Read + ?Sized>(r: &mut R, buf: &mut Vec<u8>) -> Result<usize>
 
 /// The `Read` trait allows for reading bytes from a source.
 ///
-/// Implementors of the `Read` trait are sometimes called 'readers'.
+/// Implementors of the `Read` trait are called 'readers'.
 ///
 /// Readers are defined by one required method, `read()`. Each call to `read`
 /// will attempt to pull bytes from this source into a provided buffer. A