fix typo (#1266)

Documentation/Flashing.md

@@ -90,11 +90,11 @@ Check the extension of your firmware, it should be `.RDY` now.
 # Pinecil (Pine64)
 
 - The MCU used in Pinecil supports usb-dfu. Reference [Pinecil Wiki](https://wiki.pine64.org/wiki/Pinecil).
-- Recommended Updater: the [Pine64 Updater](https://github.com/pine64/pinecil-firmware-updater/releases), is an easy to use GUI app. It is fast, and works in several types of OS, i.e. Windows/Mac. It will automatically fetch the newest stable version of IronOS from Github.
-- Tourbleshooting: if you have issues using the Pine64 Updater or your install fails, please go to troubleshooting tips below.
+- Recommended Updater: the [Pine64 Updater](https://github.com/pine64/pinecil-firmware-updater/releases), is an easy-to-use GUI app. It is fast and works in several types of OS, i.e. Windows/Mac. It will automatically fetch the newest stable version of IronOS from Github.
+- Troubleshooting: if you have issues using the Pine64 Updater or your install fails, please go to troubleshooting tips below.
 - Community chat: if troubleshooting doesn't work, then join the Pine64 > Pinecil channel. There are knowledgeable members in Discord/Telegram/Matrix. Discord has a bridge bot connection to Telegram and Matrix so that all pine volunteers/members can see advice for Pinecil and related items or just get tips on which Power supply to purchase.
 - One advantage of Pinecil is that you can not permanently damage it doing a firmware update (because DFU is in ROM); an update could render Pinecil temporarily inoperable if you flash an invalid firmware. But no worries, simply re-flashing with a working firmware copy will fix everything.
-- USB-C cable is required to do an update. Generally all usb controllers work, but some hubs have issues so it is preferred to avoid USB hubs for updates.
+- USB-C cable is required to do an update. Generally, all USB controllers work, but some hubs have issues so it is preferred to avoid USB hubs for updates.
 - Alternate Update Methods: if your OS is not currently supported by the [Updater](https://github.com/pine64/pinecil-firmware-updater/releases) or it does not meet your needs, i.e., you want to install a beta version, the below manual methods may be used. 
 
 ## Linux and Mac
@@ -108,7 +108,7 @@ Check the extension of your firmware, it should be `.RDY` now.
 3. Enter DFU mode: press and hold (-) button at the back of the iron (do not release).
 4. Connect USB to PC, and USB-C to back of Pinecil, keep holding (-) button down.
 5. The screen will stay **black/off** to indicate the Pinecil is in DFU mode. This is normal.
-6. Once USB cable is connected at two ends, wait 10 seconds more, then release the (-) button.
+6. Once the USB cable is connected at two ends, wait 10 seconds more, then release the (-) button.
 7. Using `dfu-util` you can flash the firmware using a command line like this:
 
 ```