Kernel slides: add probably missing word

- Please revert if I guessed wrong

Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>

slides/kernel-driver-development-interrupts/kernel-driver-development-interrupts.tex

@@ -145,8 +145,8 @@ \subsection{Interrupt Management}
   \begin{itemize}
   \item The interrupt handler is executed inside a thread.
   \item Allows to block during the interrupt handler, which is often
-        needed for I2C/SPI devices as the interrupt handler needs to
-        communicate with them.
+        needed for I2C/SPI devices as the interrupt handler needs time
+	to communicate with them.
   \item Allows to set a priority for the interrupt handler
         execution, which is useful for real-time usage of Linux
   \end{itemize}