remove last 3 typos

Signed-off-by: notgivenby <notgivenby@gmail.com>

Author: notgivenby

Installing-and-Configuring/Flashing-Guides/T480-maximized.md

@@ -24,7 +24,7 @@ For whole procedure you will need:
 
 There is still debate over which programmer and software should be used (flashprog vs. flashrom). Before following this guide, make sure you read [README.md](https://github.com/linuxboot/heads/tree/master/blobs/xx80/README.md) and the related information.
 
-Some ThinkPad T480 units on the used market are affected by an Intel bug in the Thunderbolt firmware. In short, the flash chip becomes full, causing Thunderbolt fast charging to stop working, though slow charging still functions. This issue can also affect the USB-C port. For convenience, Heads provides a fixed and padded Thunderbolt firmware that resolves the "charging problem" if your laptop is affected. Board testers did not encounter this issue, and it is unlikely to occur if your laptop was in use for more than 12 months before flashing. If you do experience the "charging bug," it is possible to fix it with external flashing. Also the update is possible prior flashing heads using [fwupd from a Linux distribution](https://www.reddit.com/r/thinkpad/comments/12tf6xv/psa_t480_thunderbolt_controller_v23_is_now_on/?rdt=44850)
+Some ThinkPad T480 units on the used market are affected by an Intel bug in the Thunderbolt firmware. In short, the flash chip becomes full, causing Thunderbolt fast charging to stop working, though slow charging still functions. This issue can also affect the USB-C port. For convenience, Heads provides a fixed and padded Thunderbolt firmware that resolves the "charging problem" if your laptop is affected. Board testers did not encounter this issue, and it is unlikely to occur if your laptop was in use for more than 12 months before flashing. If you do experience the "charging bug," it is possible to fix it with external flashing. Also, the update is possible prior flashing heads using [fwupd from a Linux distribution](https://www.reddit.com/r/thinkpad/comments/12tf6xv/psa_t480_thunderbolt_controller_v23_is_now_on/?rdt=44850)
 
 Please note that as of March 2025, Thunderbolt data transfer is not supported upstream by [coreboot](https://review.coreboot.org/c/coreboot/+/83274). However, video output through Thunderbolt and charging still work. This means only the USB-C charging port can be used for data transfer.
 
@@ -92,13 +92,13 @@ sha256sum t480_original_bios_1.bin
 My dumps were the same. 
 ![Comparison]({{ site.baseurl }}/images/T480/8_sha256.jpg)
 
-Alternative compairson is bit-by-bit. If the files are the same, there should be no output of this command. Otherwise, you will see a bit-by-bit difference between the files.
+Alternative comparison is bit-by-bit. If the files are the same, there should be no output of this command. Otherwise, you will see a bit-by-bit difference between the files.
 
 ```shell
 diff <(hexdump -C t480_original_bios.bin) <(hexdump -C t480_original_bios_1.bin)
 ```
 
-If the files differ or the chip content does not match the dump, try reconnecting your programmer to the SPI flash chip and make sure your flashrom/flashprog software is up to date.
+If the files differ or the chip content does not match the dump, try reconnecting your programmer to the SPI flash chip and make sure your flashrom/flashprog software is up-to-date.
 
 
 If they are the same, then write `T480-hotp-maximized.rom` to the SPI flash chip:
@@ -116,7 +116,7 @@ Two reboots are sometimes needed after flashing. Force a power off by holding th
 
 You should then follow through with [configuring keys]({{ site.baseurl }}/Configuring-Keys/).
 
-## Flash Thundebolt firmware
+## Flash Thunderbolt firmware
 Important, ensure that power supply and all batteries, including the CMOS battery, are disconnected. After connecting the clip to the Thunderbolt chip as shown in the figure above read from the chip, making sure the connection is stable. The procedure is similar to the flashing Heads on the SPI chip. Therefore, comments are skipped.
 
 ```shell