[Form] Update UPGRADE-2.3.md to account for #9388#9804

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ureimers wants to merge 6 commits intosymfony:masterfrom

ureimers:patch-2

Commits on Dec 17, 2013

Update UPGRADE-2.3.md
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Fixed typo and additional character
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Added missing escape ending ("```") to code block
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Commits on Dec 18, 2013

Updated wording and removed alternative
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Commits on Dec 28, 2013

[Form] Fixed wording in the UPGRADE file
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Commits on Jan 2, 2014

Merge pull request #1 from bschussek/issue9804
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