Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 1820887..46cf7be 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -779,7 +779,7 @@
 		/* IF: it doesn't fit, use 'mtu' - the data space left */
 		if (len > mtu)
 			len = mtu;
-		/* IF: we are not sending upto and including the packet end
+		/* IF: we are not sending up to and including the packet end
 		   then align the next start on an eight byte boundary */
 		if (len < left)	{
 			len &= ~7;