Added note about table naming, fixed some spelling and file naming errors as well

manual/docs/Getting started - Setting table definition - Table and class naming.php

+Doctrine automatically creates table names from the record class names. For this reason, it is recommended to name your record classes using the following rules:
+<ul>
+    <li>Use CamelCase naming</li>
+    <li>Underscores are allowed</li>
+    <li>The first letter must be capitalized</li>
+</ul>
+Example. My_PerfectClass
+<br />
+If you need to use a different naming schema, you can override this using the setTableName() method in the setTableDefinition() method.