Small typo/grammar fix.
merged branch DanielleSuurlant/master (PR #568)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #568).

Discussion
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Small typo/grammar fix in web/.htaccess

Commits
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a7f40f2 Small typo/grammar fix.
Merge pull request #21 from symfony/2.3

Merge symfony/standard with Lexance/symfony-multidomain [2.3]