doc: add missing gendummydata.py dependencies in TESTING

Signed-off-by: Filipe Laíns <lains@archlinux.org>
Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>

TESTING

@@ -14,7 +14,8 @@ INSTALL.
     # pacman -S --needed php php-sqlite sqlite words fortune-mod \
                          python python-sqlalchemy python-alembic \
                          python-fastapi uvicorn nginx \
-                         python-authlib python-itsdangerous python-httpx
+                         python-authlib python-itsdangerous python-httpx \
+                         words fortune-mod
 
    Ensure to enable the pdo_sqlite extension in php.ini.