The gdb/NEWS file documents this addition as: ** A new command, "rbreak" has been added to the Python API. This command allows the setting of a large number of breakpoints via a regex pattern in Python. See the manual for further details. However, this is not a new *command*. This a new *function*. Will fix.
The gdb-8.1-branch branch has been updated by Joel Brobecker <brobecke@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=c58318003f7fd63e43b0b6aea045bc16bada8c50 commit c58318003f7fd63e43b0b6aea045bc16bada8c50 Author: Joel Brobecker <brobecker@adacore.com> Date: Fri Feb 9 16:04:38 2018 +0400 gdb/NEWS: Clarify the news entry for "rbreak" in GDB 8.1 gdb/ChangeLog: PR gdb/22824: * NEWS <Changes in GDB 8.1>: Clarify that "rbreak" is a new Python function, rather than a new command.
fixed.