This PR was submitted for the 4.0 branch but it was merged into the 3.3 branch instead (closes #8831).

Discussion
----------

Update collection.rst

A default value is set and seems to work for the `entry_type` option.
https://github.com/symfony/symfony/blob/3ce9c29ae44692555d15983c7537187f5566e9ce/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php#L97

Commits
-------

5084ad1 Update collection.rst

This PR was submitted for the 4.0 branch but it was merged into the 3.3 branch instead (closes #8831).

Discussion
----------

Update collection.rst

A default value is set and seems to work for the `entry_type` option.
https://github.com/symfony/symfony/blob/3ce9c29ae44692555d15983c7537187f5566e9ce/src/Symfony/Component/Form/Extension/Core/Type/CollectionType.php#L97

Commits
-------

5084ad1 Update collection.rst

* 2.8:
  minor symfony#8205 Move JavaScript to separate file (technetium, javiereguiluz)
  [error_pages] Removing misleading  checker in code example
  add default option value for collection type
  minor symfony#8831 Update collection.rst (babaorum)
  Move JavaScript to seperate file
  Remove section about forms using validation
  Removed extra class
  Renamed TestedTypeTests to TestedTypeTest
  Add docs about the validator TypeTestCase class

* 2.8:
  minor symfony#8205 Move JavaScript to separate file (technetium, javiereguiluz)
  [error_pages] Removing misleading  checker in code example
  add default option value for collection type
  minor symfony#8831 Update collection.rst (babaorum)
  Move JavaScript to seperate file
  Remove section about forms using validation
  Removed extra class
  Renamed TestedTypeTests to TestedTypeTest
  Add docs about the validator TypeTestCase class

* 3.3: (22 commits)
  add note about same-state transitions
  minor symfony#8205 Move JavaScript to separate file (technetium, javiereguiluz)
  [error_pages] Removing misleading  checker in code example
  Updated LDAP documentation for Symfony 3.1
  Updating example README to match note below it
  Update docs for setting custom response code in exception handler
  add default option value for collection type
  minor symfony#8831 Update collection.rst (babaorum)
  minor symfony#8987 Fix YAML config bug (Holicz, javiereguiluz)
  Move JavaScript to seperate file
  Remove section about forms using validation
  Removed extra class
  Update fomr testing sentence
  Renamed TestedTypeTests to TestedTypeTest
  ...

* 3.4: (30 commits)
  add note about same-state transitions
  minor symfony#8205 Move JavaScript to separate file (technetium, javiereguiluz)
  [Workflow] Document the new transition completed event
  [error_pages] Removing misleading  checker in code example
  fix syntax errors and add some more crosslinks
  Updated LDAP documentation for Symfony 3.1
  Updating example README to match note below it
  Update docs for setting custom response code in exception handler
  add default option value for collection type
  minor symfony#8831 Update collection.rst (babaorum)
  minor symfony#8987 Fix YAML config bug (Holicz, javiereguiluz)
  ...