doc: update PG 10 item about referencing many relations

Reported-by: Tom Lane

diff --git a/doc/src/sgml/release-10.sgml b/doc/src/sgml/release-10.sgml
index dfe003bddb0e376eaa91bfb1937af7f447de0577..1d63e6912289ff71a18b6d5d1def51f2e1ff9910 100644 (file)
--- a/doc/src/sgml/release-10.sgml
+++ b/doc/src/sgml/release-10.sgml
@@ -813,8 +813,8 @@
        2017-03-27 [090010f2e] Improve performance of find_tabstat_entry()/get_tabstat_
        -->
        
-        Improve table creation speed in sessions that reference many
-        relations (Aleksander Alekseev)
+        Reduce statistics tracking overhead in sessions that reference
+        many thousands of relations (Aleksander Alekseev)