Fix common misspellings

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
diff --git a/Documentation/filesystems/path-lookup.txt b/Documentation/filesystems/path-lookup.txt
index eb59c8b..3571667 100644
--- a/Documentation/filesystems/path-lookup.txt
+++ b/Documentation/filesystems/path-lookup.txt
@@ -42,7 +42,7 @@
 A name string specifies a start (root directory, cwd, fd-relative) and a
 sequence of elements (directory entry names), which together refer to a path in
 the namespace. A path is represented as a (dentry, vfsmount) tuple. The name
-elements are sub-strings, seperated by '/'.
+elements are sub-strings, separated by '/'.
 
 Name lookups will want to find a particular path that a name string refers to
 (usually the final element, or parent of final element). This is done by taking
@@ -354,7 +354,7 @@
 
 What this shows is that failed rcu-walk lookups, ie. ones that are restarted
 entirely with ref-walk, are quite rare. Even the "vfstest" case which
-specifically has concurrent renames/mkdir/rmdir/ creat/unlink/etc to excercise
+specifically has concurrent renames/mkdir/rmdir/ creat/unlink/etc to exercise
 such races is not showing a huge amount of restarts.
 
 Dropping from rcu-walk to ref-walk mean that we have encountered a dentry where