Used to be /usr/share/doc/cmake-docs/: a leftover from cmake-docs -> cmake-doc rename. (LP: #669197)
This package uses quilt for upstream source code patch management. Please read /usr/share/doc/quilt/README.source for more information how to apply, unapply, add, modify or remove patches. Please note that /usr/share/doc/quilt/README.source is only available in quilt version 0.46-4.1 or later.