[TASK] Make PHP the default language for code blocks
[TASK] Make PHP the default language for code blocks

The documentation now uses PHP as default language for code blocks,
so that even when using just two colons to start a code-block it is
highlighted.

Change-Id: I9d5e926125ec6c7e4f7c0a9cc2b2e9a1ad42789c
Releases: master, 3.0, 2.3, 2.2, 2.1, 2.0, 1.1
Original-Commit-Hash: 3b8707aec849c217a7566868ebd86708aceb37f9

robertlemke/flow-development-collection,robertlemke/flow-development-collection,daniellienert/flow-development-collection,neos/flow-development-collection,chewbakartik/flow-development-collection,albe/flow-development-collection,fcool/flow-development-collection,gerhard-boden/flow-development-collection,kdambekalns/flow-development-collection,daniellienert/flow-development-collection,daniellienert/flow-development-collection,neos/flow-development-collection,aertmann/flow-development-collection,fcool/flow-development-collection,robertlemke/flow-development-collection,neos/flow-development-collection,kdambekalns/flow-development-collection,dlubitz/flow-development-collection,kitsunet/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,bwaidelich/flow-development-collection,dfeyer/flow-development-collection,bwaidelich/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,chewbakartik/flow-development-collection,albe/flow-development-collection,kitsunet/flow-development-collection,bwaidelich/flow-development-collection,mkeitsch/flow-development-collection,robertlemke/flow-development-collection,mkeitsch/flow-development-collection,dlubitz/flow-development-collection,kitsunet/flow-development-collection,neos/flow-development-collection,albe/flow-development-collection,aertmann/flow-development-collection,aertmann/flow-development-collection,dfeyer/flow-development-collection,gerhard-boden/flow-development-collection,dfeyer/flow-development-collection,dlubitz/flow-development-collection,mkeitsch/flow-development-collection,kdambekalns/flow-development-collection,gerhard-boden/flow-development-collection,fcool/flow-development-collection