[2.3] Examples that points to the DataCollectorListener should be removed.
Added a note about the total deprecation of YUI
Fixed the official name of Node.js
Reverted removal, removed API links instead
tweaks to the contribution chapter
add note about parameters in imports
add description for the `validation_groups` option
Insert a missing word

This phrase part was missing the «it» word as a subject.

New lines were reorganized a bit in order to respect the 80 character
wrap length.
minor #4278 Missing word in DependencyInjection => Types of Injection (fabschurt)

This PR was merged into the 2.3 branch.

Discussion
----------

Missing word in DependencyInjection => Types of Injection

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | 2.3+
| Fixed tickets | n/a

Commits
-------

2377280 Insert a missing word
Documented info method
feature #4047 Documented info method (WouterJ)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #4047).

Discussion
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Documented info method

| Q   | A
| --- | ---
| Doc fix? | no
| New docs? | yes (symfony/symfony#11453)
| Applies to | 2.6+
| Fixed tickets | -

Commits
-------

37d5361 Documented info method
Removing 2.6 message from the 2.3 branch
feature #4195 Added a note about the total deprecation of YUI (javiereguiluz)

This PR was merged into the 2.3 branch.

Discussion
----------

Added a note about the total deprecation of YUI

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes
| Applies to    | 2.3+
| Fixed tickets | -

Maybe we could also close the related issue #1841?

Commits
-------

f5021d5 Fixed the official name of Node.js
d027c80 Added a note about the total deprecation of YUI
minor #4226 add note about parameters in imports (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

add note about parameters in imports

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #4207

Commits
-------

a4e36ff add note about parameters in imports
change misleading language identifier
changed dash to underscore
formatting to follow 72 characters line limit
Added information about float choice lists
feature #4241 [Form] Added information about float choice lists (peterrehm)

This PR was submitted for the 2.5 branch but it was merged into the 2.3 branch instead (closes #4241).

Discussion
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[Form] Added information about float choice lists

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

Added an information about the possibility to have a choice list with float values.

Relates to symfony/symfony#11849

Commits
-------

81e3728 Added information about float choice lists
minor #4245 [Contributing] tweaks to the contribution chapter (xabbuh)

This PR was merged into the 2.3 branch.

Discussion
----------

[Contributing] tweaks to the contribution chapter

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

Some tweaks for the changes made in #4223.

@javiereguiluz Sorry,  didn't find the time to review it in the first run.

Commits
-------

f4b0b8e tweaks to the contribution chapter