Fix some typos

Author: StollD

src/control.h

@@ -91,7 +91,7 @@ static inline int ipts_control_refill_buffer(struct ipts_context *ipts, u32 buff
 {
 	/*
 	 * IPTS expects structured data in the feedback buffer matching the buffer that will be
-	 + refilled. We don't know what that data looks like, so we just keep the buffer empty.
+	 * refilled. We don't know what that data looks like, so we just keep the buffer empty.
 	 * This results in an INVALID_PARAMS error, but the buffer gets refilled without an issue.
 	 * Sending a minimal structure with the buffer ID fixes the error, but breaks refilling
 	 * the buffers on some devices.

src/spec-device.h

@@ -110,7 +110,7 @@ static_assert(sizeof(struct ipts_command) == 324);
 /**
  * enum ipts_mode - Configures what data the device produces and how its sent.
  * @IPTS_MODE_EVENT:    The device will send an event once a buffer was filled.
- *                      Older device will return singletouch data in this mode.
+ *                      Older devices will return singletouch data in this mode.
  * @IPTS_MODE_DOORBELL: The device will notify the driver by incrementing the doorbell value.
  *                      Older devices will return multitouch data in this mode.
  */