bug symfony#6081 [cookbook New project] Fix symfony version and initial add (bigs21)

This PR was merged into the 3.0 branch.

Discussion
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[cookbook New project] Fix symfony version and initial add

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 3.0
| Fixed tickets |

Also add var dir, so that var/cache and var/logs can be added too.
Commit "add basic Symfony Standard 3.X.Y" instead of "add basic Symfony Standard 2.X.Y".

Commits
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6b6ac3d Fix symfony version and initial add

Author: wouterj

cookbook/workflow/new_project_svn.rst

@@ -75,7 +75,7 @@ with these steps:
    .. code-block:: bash
 
         $ cd myproject/
-        $ svn add --depth=empty app var/cache var/logs app/config web
+        $ svn add --depth=empty app var var/cache var/logs app/config web
 
         $ svn propset svn:ignore "vendor" .
         $ svn propset svn:ignore "bootstrap*" var/
@@ -92,7 +92,7 @@ with these steps:
    .. code-block:: bash
 
         $ svn add --force .
-        $ svn ci -m "add basic Symfony Standard 2.X.Y"
+        $ svn ci -m "add basic Symfony Standard 3.X.Y"
 
 That's it! Since the ``app/config/parameters.yml`` file is ignored, you can
 store machine-specific settings like database passwords here without committing