Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/wanrouter/wanproc.c b/net/wanrouter/wanproc.c
index 11f25c7..f346395 100644
--- a/net/wanrouter/wanproc.c
+++ b/net/wanrouter/wanproc.c
@@ -51,7 +51,7 @@
 
 /*
  *	Structures for interfacing with the /proc filesystem.
- *	Router creates its own directory /proc/net/router with the folowing
+ *	Router creates its own directory /proc/net/router with the following
  *	entries:
  *	config		device configuration
  *	status		global device statistics