Address a Sphinx duplicate label warning
Both doc/man/ddns-confgen.rst and doc/man/tsig-keygen.rst include bin/confgen/tsig-keygen.rst, which defines a "man_tsig-keygen" label. This triggers the following warning when running sphinx-build with the -W command line switch in the doc/man/ directory: ../../bin/confgen/tsig-keygen.rst:27: WARNING: duplicate label man_tsig-keygen, other instance in /tmp/bind9/doc/man/ddns-confgen.rst Move the offending label from bin/confgen/tsig-keygen.rst to the proper spot in doc/arm/manpages.rst to avoid effectively defining it twice in different source documents while still allowing the relevant man page to be referenced in the ARM. Also rename that label so that it more closely matches the content it points to. As the label no longer immediately precedes a section title in its new location, use :ref:`Title <label>` syntax for the only reference to the tsig-keygen/ddns-confgen man page in the ARM.
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