#307 add sequence support (part 4 - update TOC)

README.md

@@ -311,6 +311,7 @@ but existing elements and relationships can be reused as participants and calls
       - **boundaries have to be defined without `{` and `}`** and instead of `}` the **`Boundary_End()`** macro has to be called
     - Additional (element specific) Macros:
       - `Boundary_End()`
+    - Additional (element specific) Layout Options:
       - `SHOW_ELEMENT_DESCRIPTIONS(?show)`
       - `SHOW_FOOT_BOXES(?show)`
     - Only following 3 relationship specific macros are supported:

Themes.md

@@ -16,6 +16,7 @@
     - [C4_violet](#c4_violet)
   - [Write custom themes](#write-custom-themes)
     - [Following variables could be set in a theme, additional to the skinparams and styles](#following-variables-could-be-set-in-a-theme-additional-to-the-skinparams-and-styles)
+    - [(C4 styled) Sequence diagram and themes](#c4-styled-sequence-diagram-and-themes)
 - samples
   - [📄 C4 Model Diagrams](samples/C4CoreDiagrams.md#c4-model-diagrams)