Added config example for Varnish 4.0
add sidebar for the built-in server in VMs
Reworded a misleading Doctrine explanation
Removed extra parenthesis
Missing space
Remove incoherence between Doctrine and Propel introduction paragraphs
bug #4350 Removed extra parenthesis (sivolobov)

This PR was merged into the 2.3 branch.

Discussion
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Removed extra parenthesis

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

Commits
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6e9e1e6 Removed extra parenthesis
minor #4355 Missing space (ErikSaunier)

This PR was merged into the 2.3 branch.

Discussion
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Missing space

Commits
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7ae8285 Missing space
fix Twig-extensions links
Fixed link to documentation standards
minor #4358 Fixed link to documentation standards (sivolobov)

This PR was merged into the 2.3 branch.

Discussion
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Fixed link to documentation standards

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

Commits
-------

49e5dad Fixed link to documentation standards
Added missing closing parenthesis to example.
minor #4359 Added missing closing parenthesis to example. (mattjanssen)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #4359).

Discussion
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Added missing closing parenthesis to example.

Commits
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d1bfa91 Added missing closing parenthesis to example.
minor #4357 fix Twig-extensions links (mhor)

This PR was merged into the 2.3 branch.

Discussion
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fix Twig-extensions links

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

related https://github.com/twigphp/Twig/pull/1554, https://github.com/twigphp/Twig-extensions/pull/123

Commits
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82ea9df fix Twig-extensions links
Missing apostrophe in source example.
bug #4362 Missing apostrophe in source example. (astery)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4362).

Discussion
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Missing apostrophe in source example.

Commits
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6c10845 Missing apostrophe in source example.
changed submit button label

we create a "task" not a "post"...
minor #4364 changed submit button label (OskarStark)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4364).

Discussion
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changed submit button label

we create a "task" not a "post"...

Commits
-------

d3ea36c changed submit button label
Fixed typo
[reference][configuration][security]Added key_length for pbkdf2 encoder