docs: ABI: Fix "firwmare" to "firmware"

Fix misspelling reported by codespell

Signed-off-by: Sumanth Gavini <sumanth.gavini@yahoo.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://patch.msgid.link/20250517110332.1289718-1-sumanth.gavini@yahoo.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

Author: sumanth-gavini

Documentation/ABI/testing/sysfs-bus-cxl

@@ -242,7 +242,7 @@ Description:
 		decoding a Host Physical Address range. Note that this number
 		may be elevated without any regionX objects active or even
 		enumerated, as this may be due to decoders established by
-		platform firwmare or a previous kernel (kexec).
+		platform firmware or a previous kernel (kexec).
 
 
 What:		/sys/bus/cxl/devices/decoderX.Y