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imager/README.txt: typo, grammar, style fixes

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Raspberry Pi 4 EEPROM bootloader rescue image Raspberry Pi 4 EEPROM bootloader rescue image
********************************************* *********************************************
The Raspberry Pi 4 has a small EEPROM used to store the bootloader. The Raspberry Pi 4 has a small EEPROM chip used to store the bootloader.
This rescue image reverts the bootloader EEPROM to factory default settings. This rescue image reverts the bootloader EEPROM to factory default settings.
This rescue image also updates the USB 3.0 (VL805) firmware to the latest This rescue image also updates the USB 3.0 (VL805) firmware to the latest
version (138a1) with better full-speed Isochronous endpoint support. version (138a1) with better full-speed isochronous endpoint support.
This easiest method for creating EEPROM rescue images or formatting sdcards The easiest method for creating EEPROM rescue images, and formatting SD cards,
is to use the Raspberry Pi Imager from https://raspberrypi.com/software. is to use Raspberry Pi Imager from https://raspberrypi.com/software.
The imager provides a GUI for downloading the latest version of this rescue Imager provides a GUI for downloading the latest version of this rescue
image and flashing it to a spare SD CARD. image and flashing it to a spare SD card.
Alternatively, copy the contents of this zip file to a blank Alternatively, copy the contents of this zip file to a blank
FAT formatted SD-CARD. The FAT partition must be < 32 GB. FAT formatted SD card. The FAT partition must be < 32 GB.
To update the EEPROMs: To update the EEPROM:
1. Power off the Raspberry Pi 1. Power off the Raspberry Pi
2. Insert the SD-CARD 2. Insert an SD card containing the files from this zip file
3. Power on Raspberry Pi 3. Power on the Raspberry Pi
4. Wait at least 10 seconds 4. Wait at least 10 seconds
If successful, the green LED light will blink rapidly (forever), otherwise If successful, the green LED light on the Raspberry Pi will blink rapidly forever.
an error pattern will be displayed. An unsuccessful update of the EEPROM is indicated by an alternate blinking pattern
corresponding to the specific error.
If a HDMI display is attached then the screen will display green for success If an HDMI display is attached, then the screen will display green for success
or red if a failure occurs. or red if a failure occurs.
The SD-CARD can now be removed and re-formatted using the Raspberry Pi Imager Once the EEPROM is updated, the SD card can be removed.
e.g. to install Raspberry Pi OS.