nit: Missing empty line in the EOF

Signed-off-by: Joseph Barreca <jbarrec.tech@gmail.com>

nginx-php-mysql/backend/index.php

@@ -1,3 +1,3 @@
 <?php
     echo '<h1>hello world in php!</h1>';
-?>
+?>

nginx-php-mysql/db/password.txt

@@ -1 +1 @@
-db-q5n2g
+db-q5n2g

nginx-php-mysql/proxy/Dockerfile

@@ -1,2 +1,2 @@
 FROM nginx:1.19.8-alpine
-COPY conf /etc/nginx/conf.d/default.conf
+COPY conf /etc/nginx/conf.d/default.conf

nginx-php-mysql/proxy/conf

@@ -29,4 +29,4 @@ server {
     fastcgi_pass   backend:9000;
     fastcgi_index  index.php;
   }
-}
+}