Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/arch/blackfin/lib/memmove.S b/arch/blackfin/lib/memmove.S
index 80c240a..4eca566 100644
--- a/arch/blackfin/lib/memmove.S
+++ b/arch/blackfin/lib/memmove.S
@@ -60,7 +60,7 @@
 	[P0++] = R1;
 
 	CC = P2 == 0;             /* any remaining bytes? */
-	P3 = I0;                  /* Ammend P3 to updated ptr. */
+	P3 = I0;                  /* Amend P3 to updated ptr. */
 	IF !CC JUMP .Lbytes;
 	P3 = I1;
 	RTS;