Switch from mermaid-code -> mmd

docs/diagrams-and-syntax-and-examples/flowchart.md

@@ -247,7 +247,7 @@ If you describe the same diagram using the the basic syntax, it will take four l
 word of warning, one could go overboard with this making the graph harder to read in
 markdown form. The Swedish word `lagom` comes to mind. It means, not too much and not too little.
 This goes for expressive syntaxes as well.
-```mermaid-code
+```mmd
 graph TB
     A --> C
     A --> D
@@ -486,7 +486,7 @@ Beginners tip, a full example using interactive links in a html context:
 
 Comments can be entered within a flow diagram, which will be ignored by the parser.  Comments need to be on their own line, and must be prefaced with `%%` (double percent signs). Any text after the start of the comment to the next newline will be treated as a comment, including any flow syntax
 
-```mermaid-code
+```mmd
 graph LR
 %% this is a comment A -- text --> B{node}
    A -- text --> B -- text2 --> C