Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/include/xen/interface/elfnote.h b/include/xen/interface/elfnote.h
index 7a8262c..0360b15 100644
--- a/include/xen/interface/elfnote.h
+++ b/include/xen/interface/elfnote.h
@@ -51,7 +51,7 @@
 
 /*
  * The offset of the ELF paddr field from the acutal required
- * psuedo-physical address (numeric).
+ * pseudo-physical address (numeric).
  *
  * This is used to maintain backwards compatibility with older kernels
  * which wrote __PAGE_OFFSET into that field. This field defaults to 0