fix(tail): fix broken intra-doc link in chunks.rs documentation

The documentation comment for the fill() method contained an invalid
intra-doc link [Some(bytes)] which should be inline code `Some(bytes)`.
This caused rustdoc warnings that are treated as errors in CI with
-Dwarnings flag.

Author: naoNao89

src/uu/tail/src/chunks.rs

@@ -208,7 +208,7 @@ impl BytesChunk {
 
     /// Fills `self.buffer` with maximal [`BUFFER_SIZE`] number of bytes, draining the reader by
     /// that number of bytes. If EOF is reached (so 0 bytes are read), then returns
-    /// [`UResult<None>`] or else the result with [`Some(bytes)`] where bytes is the number of bytes
+    /// [`UResult<None>`] or else the result with `Some(bytes)` where bytes is the number of bytes
     /// read from the source.
     pub fn fill(&mut self, filehandle: &mut impl BufRead) -> UResult<Option<usize>> {
         let num_bytes = filehandle.read(&mut self.buffer)?;