Documentation: Fix spelling errors

These issues were found and fixed by codespell, a useful tool for
finding spelling errors.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: If2a8e97911420c19e9365d5c28810b998f2c2ac8
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58078
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

Documentation/security/intel/txt.md

@@ -37,7 +37,7 @@ More details can be found in the [Intel TXT IBB] chapter.
 
 ### Measurements
 The IBBs (Initial Boot Blocks) are measured into TPM's PCR0 by the BIOS [ACM]
-before the CPU reset vector is executed. To indentify the regions that need
+before the CPU reset vector is executed. To identify the regions that need
 to be measured, the [FIT] contains one ore multiple *Type 7* entries, that
 point to the IBBs.