fix typo in FuriHalDebuging.md (#2667)

documentation/FuriHalDebuging.md

@@ -1,6 +1,6 @@
 # Furi HAL Debugging
 
-Some Furi subsystem got additional debugging features that can be enabled by adding additional defines to firmware compilation.
+Some Furi subsystems got additional debugging features that can be enabled by adding additional defines to firmware compilation.
 Usually they are used for low level tracing and profiling or signal redirection/duplication.
 
 
@@ -23,4 +23,4 @@ There are 3 signals that will be exposed to external GPIO pins:
 There are 2 signals that will be exposed to external GPIO pins:
 
 - `WFI`     - `PB2` - Light sleep (wait for interrupt) used. Basically this is lightest and most non-breaking things power save mode. All function and debug should work correctly in this mode.
-- `STOP`    - `PC3` - STOP mode used. Platform deep sleep mode. Extremely fragile mode where most of the silicon is disabled or in unusable state. Debugging MCU in this mode is nearly impossible.
+- `STOP`    - `PC3` - STOP mode used. Platform deep sleep mode. Extremely fragile mode where most of the silicon is disabled or in unusable state. Debugging MCU in this mode is nearly impossible.