man.hyphenate.urls — Hyphenate URLs?
If zero (the default), hyphenation is suppressed for output of
the ulink url attribute.
If hyphenation is already turned off globally (that is, if
man.hyphenate is zero, setting
man.hyphenate.urls is not necessary.
If man.hyphenate.urls is non-zero, URLs
will not be treated specially and are subject to hyphenation just like
other words.
If you are thinking about setting a non-zero value for
man.hyphenate.urls in order to make long
URLs break across lines, you'd probably be better off
experimenting with setting the
man.break.after.slash parameter first. That
will cause long URLs to be broken after slashes.