Without further ado, the following was found:

Issue:    I<usage()>  → I<usage>()

"The program below is designed to allow experimenting with user namespaces, "
"as well as other types of namespaces.  It creates namespaces as specified by "
"command-line options and then executes a command inside those namespaces.  "
"The comments and I<usage()> function inside the program provide a full "
"explanation of the program.  The following shell session demonstrates its "
"use."