Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 1663e1a..3a43a83 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -207,7 +207,7 @@
 		/*
 		 * This may look like an off by one error but it is a bit more
 		 * subtle. 108 is the longest valid AF_UNIX path for a binding.
-		 * sun_path[108] doesnt as such exist.  However in kernel space
+		 * sun_path[108] doesn't as such exist.  However in kernel space
 		 * we are guaranteed that it is a valid memory location in our
 		 * kernel address buffer.
 		 */