/usr/share/doc/bash/examples/functions/ is in bash-doc 4.4.18-2ubuntu1.
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/usr/share/doc/bash/examples/functions/array-stuff
/usr/share/doc/bash/examples/functions/array-to-string
/usr/share/doc/bash/examples/functions/autoload
/usr/share/doc/bash/examples/functions/autoload.v2
/usr/share/doc/bash/examples/functions/autoload.v3
/usr/share/doc/bash/examples/functions/basename
/usr/share/doc/bash/examples/functions/csh-compat
/usr/share/doc/bash/examples/functions/dirname
/usr/share/doc/bash/examples/functions/dirstack
/usr/share/doc/bash/examples/functions/exitstat
/usr/share/doc/bash/examples/functions/external
/usr/share/doc/bash/examples/functions/fact
/usr/share/doc/bash/examples/functions/fstty
/usr/share/doc/bash/examples/functions/func
/usr/share/doc/bash/examples/functions/inetaddr
/usr/share/doc/bash/examples/functions/inpath
/usr/share/doc/bash/examples/functions/isnum2
/usr/share/doc/bash/examples/functions/isvalidip
/usr/share/doc/bash/examples/functions/ksh-cd
/usr/share/doc/bash/examples/functions/ksh-compat-test
/usr/share/doc/bash/examples/functions/kshenv
/usr/share/doc/bash/examples/functions/login
/usr/share/doc/bash/examples/functions/notify.bash
/usr/share/doc/bash/examples/functions/seq
/usr/share/doc/bash/examples/functions/seq2
/usr/share/doc/bash/examples/functions/shcat
/usr/share/doc/bash/examples/functions/shcat2
/usr/share/doc/bash/examples/functions/sort-pos-params
/usr/share/doc/bash/examples/functions/substr
/usr/share/doc/bash/examples/functions/substr2
/usr/share/doc/bash/examples/functions/whatis
/usr/share/doc/bash/examples/functions/whence
/usr/share/doc/bash/examples/functions/which