Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/linux/sunrpc/svcauth_gss.h b/include/linux/sunrpc/svcauth_gss.h
index ca7d725..83bbee3 100644
--- a/include/linux/sunrpc/svcauth_gss.h
+++ b/include/linux/sunrpc/svcauth_gss.h
@@ -2,7 +2,7 @@
  * linux/include/linux/sunrpc/svcauth_gss.h
  *
  * Bruce Fields <bfields@umich.edu>
- * Copyright (c) 2002 The Regents of the Unviersity of Michigan
+ * Copyright (c) 2002 The Regents of the University of Michigan
  */
 
 #ifndef _LINUX_SUNRPC_SVCAUTH_GSS_H