Added upgrade info for #9601
minor #9972 Upgrade File for 2.5 (Danez)

This PR was merged into the 2.5-dev branch.

Discussion
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Upgrade File for 2.5

Added upgrade info for #9601, as this pr might break code which overwrites this method and also to respect symfony/symfony-docs#3439.

Commits
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fefcf41 Added upgrade info for #9601
[Form] Errors now reference the field they were added to and the violation/exception that caused them
feature #9993 [Form] Errors now reference the field they were added to and the violation/exception that caused them (bschussek)

This PR was merged into the 2.5-dev branch.

Discussion
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[Form] Errors now reference the field they were added to and the violation/exception that caused them

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9472, #9582
| License       | MIT
| Doc PR        | -

Commits
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c8a0ee6 [Form] Errors now reference the field they were added to and the violation/exception that caused them
[Routing][FrameworkBundle] Deprecated the apache dumper
feature #9980 [Routing][FrameworkBundle] Deprecated the apache dumper (jakzal)

This PR was squashed before being merged into the 2.5-dev branch (closes #9980).

Discussion
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[Routing][FrameworkBundle] Deprecated the apache dumper

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | yes
| Tests pass?   | yes
| Fixed tickets | #9652
| License       | MIT
| Doc PR        | https://github.com/symfony/symfony-docs/pull/3446

Commits
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6258cfa [Routing][FrameworkBundle] Deprecated the apache dumper
Form debugger storage
feature #9967 Form debugger storage (WouterJ)

This PR was squashed before being merged into the 2.5-dev branch (closes #9967).

Discussion
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Form debugger storage

This PR continues #9857

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #9123
| License       | MIT
| Doc PR        | -

Commits
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744da7f Form debugger storage
[WebProfilerBundle] Simplified session storage implementation
minor #10021 [WebProfilerBundle] Simplified session storage implementation (bschussek)

This PR was merged into the 2.5-dev branch.

Discussion
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[WebProfilerBundle] Simplified session storage implementation

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Follow-up to #9967.

Commits
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cec05bf [WebProfilerBundle] Simplified session storage implementation