Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c357a31..49e9796 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -699,7 +699,7 @@
 	ekgdboc=	[X86,KGDB] Allow early kernel console debugging
 			ekgdboc=kbd
 
-			This is desgined to be used in conjunction with
+			This is designed to be used in conjunction with
 			the boot argument: earlyprintk=vga
 
 	edd=		[EDD]