/usr/share/doc/ is in libreadline-gplv2-dev 5.2+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libreadline5/
/usr/share/doc/libreadline5/examples/
/usr/share/doc/libreadline5/examples/Makefile
/usr/share/doc/libreadline5/examples/excallback.c
/usr/share/doc/libreadline5/examples/rl-fgets.c
/usr/share/doc/libreadline5/examples/manexamp.c
/usr/share/doc/libreadline5/examples/rlptytest.c
/usr/share/doc/libreadline5/examples/fileman.c
/usr/share/doc/libreadline5/examples/rlversion.c
/usr/share/doc/libreadline5/examples/rl.c
/usr/share/doc/libreadline5/examples/rlcat.c
/usr/share/doc/libreadline5/examples/rltest.c
/usr/share/doc/libreadline5/examples/histexamp.c
/usr/share/doc/libreadline-gplv2-dev