build: lint-staged docs in packages/mermaid/src/…

When running lint-staged during git pre-commit scripts,
search for docs in the packages/mermaid/src/docs folder instead
of the original src/docs folder.

.lintstagedrc.json

@@ -1,6 +1,6 @@
 {
-  "src/docs/**": ["pnpm run docs:build --git"],
-  "src/docs.mts": ["pnpm run docs:build --git"],
+  "packages/mermaid/src/docs/**": ["pnpm run docs:build --git"],
+  "packages/mermaid/src/docs.mts": ["pnpm run docs:build --git"],
   "*.{ts,js,json,html,md,mts}": ["eslint --fix", "prettier --write"],
   "*.jison": ["pnpm run lint:jison"]
 }