kernel-doc: fix fs/pipe.c notation

Fix several kernel-doc notation errors in fs/pipe.c.

Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Jens Axboe <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/pipe.c

···
  *
  * Description:
  *	This function returns a kernel virtual address mapping for the
- *	passed in @pipe_buffer. If @atomic is set, an atomic map is provided
+ *	pipe_buffer passed in @buf. If @atomic is set, an atomic map is provided
  *	and the caller has to be careful not to fault before calling
  *	the unmap function.
  *
···
 }
 
 /**
- * generic_pipe_buf_steal - attempt to take ownership of a @pipe_buffer
+ * generic_pipe_buf_steal - attempt to take ownership of a &pipe_buffer
  * @pipe:	the pipe that the buffer belongs to
  * @buf:	the buffer to attempt to steal
  *
  * Description:
- *	This function attempts to steal the @struct page attached to
+ *	This function attempts to steal the &struct page attached to
  *	@buf. If successful, this function returns 0 and returns with
  *	the page locked. The caller may then reuse the page for whatever
- *	he wishes, the typical use is insertion into a different file
+ *	he wishes; the typical use is insertion into a different file
  *	page cache.
  */
 int generic_pipe_buf_steal(struct pipe_inode_info *pipe,
···
 }
 
 /**
- * generic_pipe_buf_get - get a reference to a @struct pipe_buffer
+ * generic_pipe_buf_get - get a reference to a &struct pipe_buffer
  * @pipe:	the pipe that the buffer belongs to
  * @buf:	the buffer to get a reference to
  *