Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/trace/ring-buffer-design.txt b/Documentation/trace/ring-buffer-design.txt
index d299ff3..7d350b4 100644
--- a/Documentation/trace/ring-buffer-design.txt
+++ b/Documentation/trace/ring-buffer-design.txt
@@ -237,7 +237,7 @@
       |written  |
       +---------+
       |written  |
-      +---------+  <--- next positon for write (current commit)
+      +---------+  <--- next position for write (current commit)
       | empty   |
       +---------+