minor #931 Improve text on the welcome page (regularjack)
minor #931 Improve text on the welcome page (regularjack)

This PR was submitted for the 3.0 branch but it was merged into the 2.3 branch instead (closes #931).

Discussion
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Improve text on the welcome page

The text on the welcome page was not a proper English sentence. I took the chance to also improve the "read the docs" sentence to not mention Symfony twice.

Commits
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becd595 Improve text on the welcome page

GulDmitry/music-diff,shamcode/symfony-testing,gencer/symfony-standard,kmelia/fresh-symfony,Spea/symfony-standard,debruyne0/symfony,proteichik/testApp,symfony-cmf/standard-edition,jakzal/symfony-standard,vincentaubert/symfony-standard,gencer/symfony-standard,havvg/symfony-standard-propel,the-software-factory/superhero-api,simonjcarr/symfony_rest,havvg/symfony-propel-edition,Tobion/symfony-standard,simonjcarr/symfony_rest,GulDmitry/music-diff,dunglas/symfony-standard,the-software-factory/superhero-api,GulDmitry/music-diff,taylankasap/symfony-standard,debruyne0/symfony,fabpot/symfony-standard,stof/symfony-standard,fduch/symfony-standard-workflow,propelorm/symfony-propel-edition,uttam-vi/pardawala,apnet/symfony-standard-edition,egeloen/symfony-standard,Cartesia/01,propelorm/symfony-propel-edition,Tobion/symfony-standard,formapro-forks/api-basic,ovelasquez/ussi,shamcode/symfony-testing,egeloen/symfony-standard,taylankasap/symfony-standard,ovelasquez/ussi,apnet/symfony-standard-edition,black-project/black-standard,lyrixx/symfony-standard,uttam-vi/pardawala,GulDmitry/music-diff,apnet/symfony-standard-edition,kmelia/fresh-symfony,havvg/symfony-standard-propel,symfony/symfony-standard,umpirsky/symfony-standard,umpirsky/symfony-standard,symfony-cmf/standard-edition,vincentaubert/symfony-standard,proteichik/testApp,jakzal/symfony-standard,dunglas/symfony-standard,uttam-vi/pardawala,kmelia/fresh-symfony,black-project/black-standard,havvg/symfony-propel-edition,Cartesia/01,fduch/symfony-standard-workflow,ovelasquez/ussi,lyrixx/symfony-standard,stof/symfony-standard,Cartesia/01,formapro-forks/api-basic,Spea/symfony-standard,symfony/symfony-standard,fabpot/symfony-standard