core as a directory name is usually not a good idea

Let's follow the other places in qtbase where the
directory is named corelib.

Change-Id: Ib426f4ee7311f622a89b252b9915aca1d3dd688d
Reviewed-by: Casper van Donderen <casper.vandonderen@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

diff --git a/doc/src/core/containers.qdoc b/doc/src/corelib/containers.qdoc
similarity index 100%
rename from doc/src/core/containers.qdoc
rename to doc/src/corelib/containers.qdoc

diff --git a/doc/src/core/implicit-sharing.qdoc b/doc/src/corelib/implicit-sharing.qdoc
similarity index 100%
rename from doc/src/core/implicit-sharing.qdoc
rename to doc/src/corelib/implicit-sharing.qdoc

diff --git a/doc/src/core/objectmodel/metaobjects.qdoc b/doc/src/corelib/objectmodel/metaobjects.qdoc
similarity index 100%
rename from doc/src/core/objectmodel/metaobjects.qdoc
rename to doc/src/corelib/objectmodel/metaobjects.qdoc

diff --git a/doc/src/core/objectmodel/object.qdoc b/doc/src/corelib/objectmodel/object.qdoc
similarity index 100%
rename from doc/src/core/objectmodel/object.qdoc
rename to doc/src/corelib/objectmodel/object.qdoc

diff --git a/doc/src/core/objectmodel/objecttrees.qdoc b/doc/src/corelib/objectmodel/objecttrees.qdoc
similarity index 100%
rename from doc/src/core/objectmodel/objecttrees.qdoc
rename to doc/src/corelib/objectmodel/objecttrees.qdoc

diff --git a/doc/src/core/objectmodel/properties.qdoc b/doc/src/corelib/objectmodel/properties.qdoc
similarity index 100%
rename from doc/src/core/objectmodel/properties.qdoc
rename to doc/src/corelib/objectmodel/properties.qdoc

diff --git a/doc/src/core/objectmodel/signalsandslots.qdoc b/doc/src/corelib/objectmodel/signalsandslots.qdoc
similarity index 100%
rename from doc/src/core/objectmodel/signalsandslots.qdoc
rename to doc/src/corelib/objectmodel/signalsandslots.qdoc

diff --git a/doc/src/core/qtcore.qdoc b/doc/src/corelib/qtcore.qdoc
similarity index 100%
rename from doc/src/core/qtcore.qdoc
rename to doc/src/corelib/qtcore.qdoc

diff --git a/doc/src/core/threads-basics.qdoc b/doc/src/corelib/threads-basics.qdoc
similarity index 100%
rename from doc/src/core/threads-basics.qdoc
rename to doc/src/corelib/threads-basics.qdoc

diff --git a/doc/src/core/threads.qdoc b/doc/src/corelib/threads.qdoc
similarity index 100%
rename from doc/src/core/threads.qdoc
rename to doc/src/corelib/threads.qdoc