Update src/spi/blocking.rs

Co-authored-by: Rahix <rahix@rahix.de>

src/spi/blocking.rs

@@ -46,7 +46,7 @@
 //! consists of asserting CS, then doing one or more transfers, then deasserting CS. For the entire duration of the transaction, the [`SpiDevice`]
 //! implementation will ensure no other transaction can be opened on the same bus. This is the key that allows correct sharing of the bus.
 //!
-//! The capabilities of the bus (read-write, read-only or read-write) are determined by which of the [`SpiBus`], [`SpiBusRead`] [`SpiBusWrite`] traits
+//! The capabilities of the bus (read-write, read-only or write-only) are determined by which of the [`SpiBus`], [`SpiBusRead`] [`SpiBusWrite`] traits
 //! are implemented for the [`Bus`](SpiDevice::Bus) associated type.
 //!
 //! # For driver authors