trivial: fix typos s/paramter/parameter/ and s/excute/execute/ in documentation and source comments.

Signed-off-by: Martin Olsson <martin@minimum.se>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/arch/s390/kernel/head.S b/arch/s390/kernel/head.S
index 22596d7..2c54e970 100644
--- a/arch/s390/kernel/head.S
+++ b/arch/s390/kernel/head.S
@@ -64,7 +64,7 @@
 	.org   0x100
 #
 # subroutine for loading from tape
-# Paramters:
+# Parameters:
 #  R1 = device number
 #  R2 = load address
 .Lloader: