[doc] Tags documentation of DeactivatedSubdomain.

...bdomains/deactivated_subdomain/i_deactivated_subdomain.md

...ains/deactivated_subdomain/line_segment/i_line_segment.md

...ed_subdomains/deactivated_subdomain/line_segment/t_end.md

..._subdomains/deactivated_subdomain/line_segment/t_start.md

...ctivated_subdomains/deactivated_subdomain/t_time_curve.md

...vated_subdomains/deactivated_subdomain/t_time_interval.md

...ns/deactivated_subdomain/time_interval/i_time_interval.md

...d_subdomains/deactivated_subdomain/time_interval/t_end.md

...subdomains/deactivated_subdomain/time_interval/t_start.md

...riable/deactivated_subdomains/i_deactivated_subdomains.md

ProcessLib/DeactivatedSubdomain.h