fix: handle CRLF in snippet plugin

closes #3499

Author: brc-dd

Diff for: src/node/markdown/plugins/snippet.ts

@@ -170,10 +170,10 @@ export const snippetPlugin = (md: MarkdownIt, srcDir: string) => {
       return fence(...args)
     }
 
-    let content = fs.readFileSync(src, 'utf8')
+    let content = fs.readFileSync(src, 'utf8').replace(/\r\n/g, '\n')
 
     if (regionName) {
-      const lines = content.split(/\r?\n/)
+      const lines = content.split('\n')
       const region = findRegion(lines, regionName)
 
       if (region) {