docs: update document according to the recent update

build-docs.sh

@@ -6,7 +6,8 @@ function install-sphinx() {
     if [ ! -d "venv" ]; then
         python -m venv venv
         source venv/bin/activate
-        pip install -r requirements.txt
+        # pip install -r requirements.txt
+        pip install myst-parser
     else
         source venv/bin/activate
     fi