#2303 correct syntax error

Author: rjzupkoii

_includes/head/custom.html

@@ -17,10 +17,10 @@
 <script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
 
 <!-- Support for Mermaid -->
- <script type="module">
-    import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs';
-    mermaid.initialize({startOnLoad:true,theme:'neutral'})
-    await mermaid.run({querySelector:'code.language-mermaid'})
+<script type="module">
+import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs';
+mermaid.initialize({startOnLoad:true,theme:'neutral'});
+await mermaid.run({querySelector:'code.language-mermaid'});
 </script>
 
 <!-- end custom head snippets -->