docs: Update docsify-updated to prevent replacement (#1574)

Co-authored-by: Koy <[email protected]>

Author: sy-records

Diff for: docs/write-a-plugin.md

@@ -87,7 +87,7 @@ window.$docsify = {
           editHtml +
           html +
           '\n----\n' +
-          'Last modified {docsify-updated} ' +
+          'Last modified {docsify-updated}' +
           editHtml
         );
       });
@@ -108,4 +108,5 @@ Current version: <span id='tip-version'>loading</span>
 
 <script>
 document.getElementById('tip-version').innerText = Docsify.version
+document.getElementsByClassName("lang-js")[2].innerHTML = document.getElementsByClassName("lang-js")[2].innerHTML.replace(/Last modified .*'/,"Last modified {docsify-updated<span>}'</span>")
 </script>