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/nfsd/export.h b/include/linux/nfsd/export.h
index bd31615..84058ec 100644
--- a/include/linux/nfsd/export.h
+++ b/include/linux/nfsd/export.h
@@ -80,7 +80,7 @@
 
 /*
  * We keep an array of pseudoflavors with the export, in order from most
- * to least preferred.  For the forseeable future, we don't expect more
+ * to least preferred.  For the foreseeable future, we don't expect more
  * than the eight pseudoflavors null, unix, krb5, krb5i, krb5p, skpm3,
  * spkm3i, and spkm3p (and using all 8 at once should be rare).
  */