libcangjie: Adopt the wording of the upstream README

Something changed in the libcangjie README and wasn't pushed here.
libcangjie: Use the same example as in the upstream README

This changed upstream and wasn't pushed here.

We're now back in track.
pycangjie: Fix title syntax

THis had been changed in the upstream README but hadn't been pushed
here.

We're now back in track for pycangjie.
ibus-cangjie: Fix case in page title
libcangjie: Improve documentation page titles