Make more placeholder strings more readable by using snake case

Author: ravage84

samples/tutorials/php/1.0 PHP Configuration and Getting Started/test.php

@@ -1,11 +1,11 @@
 <?php
 echo "\n";
-$serverName = 'tcp:yourserver.database.windows.net,1433';
+$serverName = 'tcp:your_server.database.windows.net,1433';
 
 $connectionOptions = [
-    'Database' => 'yourpassword',
-    'Uid' => 'yourusername',
-    'PWD' => 'yourpassword',
+    'Database' => 'your_database',
+    'Uid' => 'your_username',
+    'PWD' => 'your_password',
 ];
 
 $conn = sqlsrv_connect($serverName, $connectionOptions);

samples/tutorials/php/2.0 PHP Server programming - Stored procedures, Transactions, and UDFs/test.php

@@ -1,9 +1,9 @@
 <?php
-$serverName = 'tcp:yourserver.database.windows.net,1433';
+$serverName = 'tcp:your_server.database.windows.net,1433';
 $connectionOptions = [
-    'Database' => 'yourdatabase',
-    'Uid' => 'yourusername',
-    'PWD' => 'yourpassword',
+    'Database' => 'your_database',
+    'Uid' => 'your_username',
+    'PWD' => ' your_password',
 ];
 // Establishes the connection
 $conn = sqlsrv_connect($serverName, $connectionOptions);