Fix punctuation.

Author: PaulMartinsen

asciidoc/volume2/history-service/tf2-ch-a-mdpws-history-service.adoc

@@ -172,7 +172,7 @@ For an <<term_mdib_sequence_of_changes>> that is requested from a <<vol1_spec_sd
 ****
 [NORMATIVE]
 ====
-For an <<term_mdib_sequence_of_changes>> that is requested from a <<vol1_spec_sdpi_p_actor_somds_provider>>, the <<vol1_spec_sdpi_p_actor_somds_provider>> shall provide exactly one <<term_mdib_configuration>> in hm:ChangeSequence/hm:HistoricMdib for each contiguous sequence of changes..
+For an <<term_mdib_sequence_of_changes>> that is requested from a <<vol1_spec_sdpi_p_actor_somds_provider>>, the <<vol1_spec_sdpi_p_actor_somds_provider>> shall provide exactly one <<term_mdib_configuration>> in hm:ChangeSequence/hm:HistoricMdib for each contiguous sequence of changes.
 ====
 
 [NOTE]