Update KeyCombo.md (flipperdevices#2213)

Grammatical corrections and changes

documentation/KeyCombo.md

@@ -1,6 +1,6 @@
 # Key Combos
 
-There are times when your flipper feels blue and doesn't respond to your commands.
+There are times when your Flipper feels blue and doesn't respond to your commands.
 In that case, you may find this guide useful.
 
 
@@ -12,10 +12,10 @@ In that case, you may find this guide useful.
 - Press `LEFT` and `BACK` and hold for a couple of seconds
 - Release `LEFT` and `BACK`
 
-This combo performs hardware reset by pulling MCU reset line down.
+This combo performs a hardware reset by pulling MCU reset line down.
 Main components involved: Keys -> DD8(NC7SZ32M5X, OR-gate) -> DD1(STM32WB55, MCU)
 
-There is 1 case when it's not working:
+There is 1 case where it does not work:
 
 - MCU debug block is active and holding reset line from inside.
 
@@ -25,32 +25,32 @@ There is 1 case when it's not working:
 - Disconnect USB and any external power supplies
 - Disconnect USB once again
 - Make sure that you've disconnected USB and any external power supplies
-- Press `BACK` and hold for 30 seconds (Only will work with USB Disconnected)
+- Press `BACK` and hold for 30 seconds (Will only work with USB disconnected)
 - If you have not disconnected USB, then disconnect USB and repeat previous step
 - Release `BACK` key
 
 This combo performs a reset by switching SYS power line off and then on.
 Main components involved: Keys -> DD6(bq25896, charger)
 
-There is 1 case when it's not working:
+There is 1 case where it does not work:
 
 - Power supply is connected to USB or 5V_ext
 
 
 ### Software DFU
 
-- Press `LEFT` on boot to enter DFU with flipper boot-loader
+- Press `LEFT` on boot to enter DFU with Flipper boot-loader
 
-There is 1 case when it's not working:
+There is 1 case where it does not work:
 
-- Flipper Boot-loader is damaged or absent
+- Flipper boot-loader is damaged or absent
 
 
 ### Hardware DFU
 
 - Press `OK` on boot to enter DFU with ST boot-loader
 
-There is 1 case when it's not working:
+There is 1 case where it does not work:
 
 - Option Bytes are damaged or set to ignore `OK` key
 
@@ -65,25 +65,25 @@ There is 1 case when it's not working:
 - Device will enter DFU with indication (Blue LED + DFU Screen)
 - Release `LEFT`
 
-This combo performs hardware reset by pulling MCU reset line down.
-Then `LEFT` key indicates to boot-loader that DFU mode is requested.
+This combo performs a hardware reset by pulling MCU reset line down.
+Then, `LEFT` key indicates to the boot-loader that DFU mode is requested.
 
-There are 2 cases when it's not working:
+There are 2 cases where it does not work:
 
 - MCU debug block is active and holding reset line from inside
-- Flipper Boot-loader is damaged or absent
+- Flipper boot-loader is damaged or absent
 
 
 ### Hardware Reset + Hardware DFU
 
-- Press `LEFT` and `BACK` and `OK` and hold for a couple of seconds
+- Press `LEFT`, `BACK` and `OK` and hold for a couple of seconds
 - Release `BACK` and `LEFT`
 - Device will enter DFU without indication
 
-This combo performs hardware reset by pulling MCU reset line down.
-Then `OK` key forces MCU to load internal boot-loader.
+This combo performs a hardware reset by pulling MCU reset line down.
+Then, `OK` key forces MCU to load internal boot-loader.
 
-There are 2 cases when it's not working:
+There are 2 cases where it does not work:
 
 - MCU debug block is active and holding reset line from inside
 - Option Bytes are damaged or set to ignore `OK` key
@@ -96,15 +96,15 @@ There are 2 cases when it's not working:
 - Release `BACK`
 - Device will enter DFU with indication (Blue LED + DFU Screen)
 - Release `LEFT`
-- Plug USB
+- Plug in USB
 
-This combo performs reset by switching SYS power line off and then on.
-Then `LEFT` key indicates to boot-loader that DFU mode requested.
+This combo performs a reset by switching SYS power line off and then on.
+Then, `LEFT` key indicates to boot-loader that DFU mode requested.
 
-There are 2 cases when it's not working:
+There are 2 cases where it does not work:
 
 - Power supply is connected to USB or 5V_ext
-- Flipper Boot-loader is damaged or absent
+- Flipper boot-loader is damaged or absent
 
 
 ### Hardware Power Reset + Hardware DFU
@@ -115,10 +115,10 @@ There are 2 cases when it's not working:
 - Device will enter DFU without indication
 - Plug USB
 
-This combo performs reset by switching SYS power line off and then on.
-Then `OK` key forces MCU to load internal boot-loader.
+This combo performs a reset by switching SYS power line off and then on.
+Then, `OK` key forces MCU to load internal boot-loader.
 
-There are 2 cases when it's not working:
+There are 2 cases where it does not work:
 
 - Power supply is connected to USB or 5V_ext
 - Option Bytes are damaged or set to ignore `OK` key
@@ -131,4 +131,4 @@ If none of the described methods were useful:
 - Disconnect the battery and connect again (Requires disassembly)
 - Try to Flash device with ST-Link or other programmer that supports SWD
 
-If you still here and your device is not working: it's not a software issue.
+If you still are here and your device is not working: it's not a software issue.