docs(sphinx-lint): Fix issues reported by sphinx-lint before adding it to pre-commit

docs/en/api-reference/peripherals/usb_host/usb_host_notes_design.rst

@@ -139,4 +139,4 @@ Grouping structure members by locking scheme makes the code more maintainable as
     obj.single_thread.varC = 1;
 
     // Accessing constant members requires no locking. But only read access is allowed
-    int local_var = obj.constant.varD;
+    int local_var = obj.constant.varD;