Update notes.md

Author: OskarStark

notes.md

@@ -21,10 +21,10 @@ Notes
 - /!\ tip / caution / node / etc... with nested reference
 - no more `colgroup` in tables ??
 - add `&nbsp` instead of simple space to lines in code blocks
-- test if there is only one <h1> in each page
+- test if there is only one `<h1>` in each page
 - we're assuming there is only one toctree per page...
 - `rst` does not exist in highlight php
 - `varnish` = C ? (highlight php)
 - `RoleDirective` ?
 - `IndexDirective` ?
-- toctree maxdepth ?
+- toctree maxdepth ?