[doc] add @plugin development guide annotation where they were missing

src/kernel_internals/runtime/boot.mli

src/kernel_services/analysis/dataflow2.mli

src/kernel_services/ast_data/cil_types.mli

src/kernel_services/ast_queries/logic_utils.mli

src/kernel_services/cmdline_parameters/typed_parameter.mli

src/kernel_services/plugin_entry_points/log.mli

src/kernel_services/visitors/visitor_behavior.mli

src/libraries/datatype/datatype.mli

src/plugins/gui/dgraph_helper.mli