Documentation: Remove remaining useless reference to acpi_fake_ecdt

>From commit cd8c93a4e04dce8f00d1ef3a476aac8bd65ae40b:

"Similar functionality was turned on by acpi_fake_ecdt=1 command line
before. Now it is on all the time."

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Signed-off-by: Adrian Bunk <bunk@kernel.org>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index b9a7722..b97e1b9 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -222,9 +222,6 @@
 			Warning: Many of these options can produce a lot of
 			output and make your system unusable. Be very careful.
 
-
-	acpi_fake_ecdt	[HW,ACPI] Workaround failure due to BIOS lacking ECDT
-
 	acpi_pm_good	[X86-32,X86-64]
 			Override the pmtimer bug detection: force the kernel
 			to assume that this machine's pmtimer latches its value